Our template IUCR-article.lyx (which depends on an external class)
fails to compile on an updated TL 2018, but compiles successfully on a
TL 2016 system. Please let me know if it compiles for you on an updated
TL 2018 system.

The file iucr.cls has not changed (has the same checksum) between the
two systems, which makes me think it is due to a change in behavior of a
package in TL.

Any idea on where I can report this failure?

The log is attached, and the first error is:

  ! LaTeX Error: Missing \begin{document}.
  
  See the LaTeX manual or LaTeX Companion for explanation.
  Type  H <return>  for immediate help.
   ...                                              
                                                    
  l.7516   \RHUBARB
                   % % hack - see above

Scott
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018) (preloaded 
format=pdflatex 2018.12.26)  3 JAN 2019 02:50
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**IUCr-article.tex
(./IUCr-article.tex
LaTeX2e <2018-12-01>

(/usr/local/texlive/texmf-local/tex/latex/IUCr/iucr.cls
\c@chapter=\count80
\c@example=\count81
Document Class: iucr 2016/01/28 IUCr article/chapter class
(/usr/local/texlive/2018/texmf-dist/tex/latex/tools/multicol.sty
Package: multicol 2018/11/09 v1.8u multicolumn formatting (FMi)
\c@tracingmulticols=\count82
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\multicoltolerance=\count86
\multicolpretolerance=\count87
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\page@free=\dimen104
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\multicolbaselineskip=\skip42
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\@tempa=\box34
\@tempa=\box35
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\@tempa=\box37
\@tempa=\box38
\@tempa=\box39
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\@tempa=\box41
\@tempa=\box42
\@tempa=\box43
\@tempa=\box44
\@tempa=\box45
\@tempa=\box46
\@tempa=\box47
\@tempa=\box48
\@tempa=\box49
\@tempa=\box50
\c@columnbadness=\count88
\c@finalcolumnbadness=\count89
\last@try=\dimen108
\multicolovershoot=\dimen109
\multicolundershoot=\dimen110
\mult@nat@firstbox=\box51
\colbreak@box=\box52
\mc@col@check@num=\count90
) (/usr/local/texlive/2018/texmf-dist/tex/latex/graphics/graphics.sty
Package: graphics 2017/06/25 v1.2c Standard LaTeX Graphics (DPC,SPQR)
(/usr/local/texlive/2018/texmf-dist/tex/latex/graphics/trig.sty
Package: trig 2016/01/03 v1.10 sin cos tan (DPC)
) (/usr/local/texlive/2018/texmf-dist/tex/latex/graphics-cfg/graphics.cfg
File: graphics.cfg 2016/06/04 v1.11 sample graphics configuration
)
Package graphics Info: Driver file: dvips.def on input line 99.
(/usr/local/texlive/2018/texmf-dist/tex/latex/graphics-def/dvips.def
File: dvips.def 2017/06/20 v3.1d Graphics/color driver for dvips
)) (/usr/local/texlive/2018/texmf-dist/tex/latex/float/float.sty
Package: float 2001/11/08 v1.3d Float enhancements (AL)
\c@float@type=\count91
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\@float@everytoks=\toks15
\@floatcapt=\box54
) (/usr/local/texlive/2018/texmf-dist/tex/latex/tools/tabularx.sty
Package: tabularx 2016/02/03 v2.11b `tabularx' package (DPC)
(/usr/local/texlive/2018/texmf-dist/tex/latex/tools/array.sty
Package: array 2018/11/13 v2.4j Tabular extension package (FMi)
\col@sep=\dimen111
\ar@mcellbox=\box55
\extrarowheight=\dimen112
\NC@list=\toks16
\extratabsurround=\skip43
\backup@length=\skip44
\ar@cellbox=\box56
)
\TX@col@width=\dimen113
\TX@old@table=\dimen114
\TX@old@col=\dimen115
\TX@target=\dimen116
\TX@delta=\dimen117
\TX@cols=\count92
\TX@ftn=\toks17
) (/usr/local/texlive/2018/texmf-dist/tex/generic/dvips/colordvi.tex) (/usr/loc
al/texlive/2018/texmf-dist/tex/latex/base/article.cls
Document Class: article 2018/09/03 v1.4i Standard LaTeX document class
(/usr/local/texlive/2018/texmf-dist/tex/latex/base/size11.clo
File: size11.clo 2018/09/03 v1.4i Standard LaTeX file (size option)
)
\c@part=\count93
\c@section=\count94
\c@subsection=\count95
\c@subsubsection=\count96
\c@paragraph=\count97
\c@subparagraph=\count98
\c@figure=\count99
\c@table=\count100
\abovecaptionskip=\skip45
\belowcaptionskip=\skip46
\bibindent=\dimen118
) (/usr/local/texlive/2018/texmf-dist/tex/latex/harvard/harvard.sty
Package: harvard 
(/usr/local/texlive/2018/texmf-dist/tex/latex/base/ifthen.sty
Package: ifthen 2014/09/29 v1.1c Standard LaTeX ifthen package (DPC)
) (/usr/local/texlive/texmf-local/tex/UbuntuTexDir/latex/html/html.sty (/usr/lo
cal/texlive/2018/texmf-dist/tex/latex/hyperref/hyperref.sty
Package: hyperref 2018/11/30 v6.88e Hypertext links for LaTeX
(/usr/local/texlive/2018/texmf-dist/tex/generic/oberdiek/hobsub-hyperref.sty
Package: hobsub-hyperref 2016/05/16 v1.14 Bundle oberdiek, subset hyperref (HO)

(/usr/local/texlive/2018/texmf-dist/tex/generic/oberdiek/hobsub-generic.sty
Package: hobsub-generic 2016/05/16 v1.14 Bundle oberdiek, subset generic (HO)
Package: hobsub 2016/05/16 v1.14 Construct package bundles (HO)
Package: infwarerr 2016/05/16 v1.4 Providing info/warning/error messages (HO)
Package: ltxcmds 2016/05/16 v1.23 LaTeX kernel commands for general use (HO)
Package: ifluatex 2016/05/16 v1.4 Provides the ifluatex switch (HO)
Package ifluatex Info: LuaTeX not detected.
Package: ifvtex 2016/05/16 v1.6 Detect VTeX and its facilities (HO)
Package ifvtex Info: VTeX not detected.
Package: intcalc 2016/05/16 v1.2 Expandable calculations with integers (HO)
Package: ifpdf 2018/09/07 v3.3 Provides the ifpdf switch
Package: etexcmds 2016/05/16 v1.6 Avoid name clashes with e-TeX commands (HO)
Package etexcmds Info: Could not find \expanded.
(etexcmds)             That can mean that you are not using pdfTeX 1.50 or
(etexcmds)             that some package has redefined \expanded.
(etexcmds)             In the latter case, load this package earlier.
Package: kvsetkeys 2016/05/16 v1.17 Key value parser (HO)
Package: kvdefinekeys 2016/05/16 v1.4 Define keys (HO)
Package: pdftexcmds 2018/09/10 v0.29 Utility functions of pdfTeX for LuaTeX (HO
)
Package pdftexcmds Info: LuaTeX not detected.
Package pdftexcmds Info: \pdf@primitive is available.
Package pdftexcmds Info: \pdf@ifprimitive is available.
Package pdftexcmds Info: \pdfdraftmode found.
Package: pdfescape 2016/05/16 v1.14 Implements pdfTeX's escape features (HO)
Package: bigintcalc 2016/05/16 v1.4 Expandable calculations on big integers (HO
)
Package: bitset 2016/05/16 v1.2 Handle bit-vector datatype (HO)
Package: uniquecounter 2016/05/16 v1.3 Provide unlimited unique counter (HO)
)
Package hobsub Info: Skipping package `hobsub' (already loaded).
Package: letltxmacro 2016/05/16 v1.5 Let assignment for LaTeX macros (HO)
Package: hopatch 2016/05/16 v1.3 Wrapper for package hooks (HO)
Package: xcolor-patch 2016/05/16 xcolor patch
Package: atveryend 2016/05/16 v1.9 Hooks at the very end of document (HO)
Package atveryend Info: \enddocument detected (standard20110627).
Package: atbegshi 2016/06/09 v1.18 At begin shipout hook (HO)
Package: refcount 2016/05/16 v3.5 Data extraction from label references (HO)
Package: hycolor 2016/05/16 v1.8 Color options for hyperref/bookmark (HO)
) (/usr/local/texlive/2018/texmf-dist/tex/latex/graphics/keyval.sty
Package: keyval 2014/10/28 v1.15 key=value parser (DPC)
\KV@toks@=\toks18
) (/usr/local/texlive/2018/texmf-dist/tex/generic/ifxetex/ifxetex.sty
Package: ifxetex 2010/09/12 v0.6 Provides ifxetex conditional
) (/usr/local/texlive/2018/texmf-dist/tex/latex/oberdiek/auxhook.sty
Package: auxhook 2016/05/16 v1.4 Hooks for auxiliary files (HO)
) (/usr/local/texlive/2018/texmf-dist/tex/latex/oberdiek/kvoptions.sty
Package: kvoptions 2016/05/16 v3.12 Key value format for package options (HO)
)
\@linkdim=\dimen119
\Hy@linkcounter=\count101
\Hy@pagecounter=\count102
(/usr/local/texlive/2018/texmf-dist/tex/latex/hyperref/pd1enc.def
File: pd1enc.def 2018/11/30 v6.88e Hyperref: PDFDocEncoding definition (HO)
Now handling font encoding PD1 ...
... no UTF-8 mapping file for font encoding PD1
)
\Hy@SavedSpaceFactor=\count103
(/usr/local/texlive/2018/texmf-dist/tex/latex/latexconfig/hyperref.cfg
File: hyperref.cfg 2002/06/06 v1.2 hyperref configuration of TeXLive
)
Package hyperref Info: Hyper figures OFF on input line 4519.
Package hyperref Info: Link nesting OFF on input line 4524.
Package hyperref Info: Hyper index ON on input line 4527.
Package hyperref Info: Plain pages OFF on input line 4534.
Package hyperref Info: Backreferencing OFF on input line 4539.
Package hyperref Info: Implicit mode ON; LaTeX internals redefined.
Package hyperref Info: Bookmarks ON on input line 4772.
\c@Hy@tempcnt=\count104
(/usr/local/texlive/2018/texmf-dist/tex/latex/url/url.sty
\Urlmuskip=\muskip10
Package: url 2013/09/16  ver 3.4  Verb mode for urls, etc.
)
LaTeX Info: Redefining \url on input line 5125.
\XeTeXLinkMargin=\dimen120
\Fld@menulength=\count105
\Field@Width=\dimen121
\Fld@charsize=\dimen122
Package hyperref Info: Hyper figures OFF on input line 6380.
Package hyperref Info: Link nesting OFF on input line 6385.
Package hyperref Info: Hyper index ON on input line 6388.
Package hyperref Info: backreferencing OFF on input line 6395.
Package hyperref Info: Link coloring OFF on input line 6400.
Package hyperref Info: Link coloring with OCG OFF on input line 6405.
Package hyperref Info: PDF/A mode OFF on input line 6410.
LaTeX Info: Redefining \ref on input line 6450.
LaTeX Info: Redefining \pageref on input line 6454.
\Hy@abspage=\count106
\c@Item=\count107
\c@Hfootnote=\count108
)
Package hyperref Info: Driver: hpdftex.
(/usr/local/texlive/2018/texmf-dist/tex/latex/hyperref/hpdftex.def
File: hpdftex.def 2018/11/30 v6.88e Hyperref driver for pdfTeX
\Fld@listcount=\count109
\c@bookmark@seq@number=\count110
(/usr/local/texlive/2018/texmf-dist/tex/latex/oberdiek/rerunfilecheck.sty
Package: rerunfilecheck 2016/05/16 v1.8 Rerun checks for auxiliary files (HO)
Package uniquecounter Info: New unique counter `rerunfilecheck' on input line 2
82.
)
\Hy@SectionHShift=\skip47
)
Package: html 1999/07/19 v1.38 hypertext commands for latex2html (nd, hws, rrm)

\c@lpart=\count111
\c@lchapter=\count112
\c@lsection=\count113
\c@lsubsection=\count114
\c@lsubsubsection=\count115
\c@lparagraph=\count116
\c@lsubparagraph=\count117
\c@lsubsubparagraph=\count118
\ptrfile=\write3
))
\colwidth=\skip48
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\@ffnote=\box57
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\b@x=\box59
\keyb@x=\box60
\@float@every@inset=\toks19
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\@ufn=\box62
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\c@refno=\count121
\@PDB=\box64
\@PDBscr@tch=\box65
\@NDB=\box66
\@NDBscr@tch=\box67
\t@tlebox=\box68
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <10.95> on input line 7516.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <8> on input line 7516.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <6> on input line 7516.

! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.7516   \RHUBARB
                 % % hack - see above
You're in trouble here.  Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

\currentlineskip=\skip50
\interblockskip=\skip51
\defaultinterblockskip=\skip52
) (/usr/local/texlive/2018/texmf-dist/tex/latex/base/inputenc.sty
Package: inputenc 2018/08/11 v1.3c Input encoding file
\inpenc@prehook=\toks20
\inpenc@posthook=\toks21
(/usr/local/texlive/2018/texmf-dist/tex/latex/base/latin9.def
File: latin9.def 2018/08/11 v1.3c Input encoding file
)) (./IUCr-article.aux)
\openout1 = `IUCr-article.aux'.

LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 48.
LaTeX Font Info:    ... okay on input line 48.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 48.
LaTeX Font Info:    ... okay on input line 48.
LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 48.
LaTeX Font Info:    ... okay on input line 48.
LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 48.
LaTeX Font Info:    ... okay on input line 48.
LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 48.
LaTeX Font Info:    ... okay on input line 48.
LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 48.
LaTeX Font Info:    ... okay on input line 48.
LaTeX Font Info:    Checking defaults for PD1/pdf/m/n on input line 48.
LaTeX Font Info:    ... okay on input line 48.
\AtBeginShipoutBox=\box69
Package hyperref Info: Link coloring OFF on input line 48.
(/usr/local/texlive/2018/texmf-dist/tex/latex/hyperref/nameref.sty
Package: nameref 2016/05/21 v2.44 Cross-referencing by name of section
(/usr/local/texlive/2018/texmf-dist/tex/generic/oberdiek/gettitlestring.sty
Package: gettitlestring 2016/05/16 v1.5 Cleanup title references (HO)
)
\c@section@level=\count122
)
LaTeX Info: Redefining \ref on input line 48.
LaTeX Info: Redefining \pageref on input line 48.
LaTeX Info: Redefining \nameref on input line 48.
(./IUCr-article.out) (./IUCr-article.out)
\@outlinefile=\write4
\openout4 = `IUCr-article.out'.

Package hyperref Info: *** compatibility with harvard ****  on input line 48.
Beginning to process article (iucr) 

Overfull \vbox (11.95555pt too high) has occurred while \output is active []


Overfull \vbox (16.0pt too high) has occurred while \output is active []

 [1
Non-PDF special ignored!
<special> papersize=614.295pt,794.96999pt
{/usr/local/texlive/2018/texmf-var/fonts/map/pdftex/updmap/pdftex.map}

]
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <7> on input line 95.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <5> on input line 95.

(./IUCr-article.bbl)pdfTeX warning (ext4): destination with the same identifier
 (name{section.0.1}) has been already used, duplicate ignored
<to be read again> 
                   \relax 
l.139 \section{An appendix section}
                                   
Finished processing article for Acta Crystallographica Section A
Package atveryend Info: Empty hook `BeforeClearDocument' on input line 146.
 [2] [3pdfTeX warning (ext4): destination with the same identifier (name{subsec
tion.0.1.1}) has been already used, duplicate ignored

\AtBegShi@Output ...ipout \box \AtBeginShipoutBox 
                                                  \fi \fi 
l.146 \end{document}
                    pdfTeX warning (ext4): destination with the same identifier
 (name{subsubsection.0.1.1.1}) has been already used, duplicate ignored

\AtBegShi@Output ...ipout \box \AtBeginShipoutBox 
                                                  \fi \fi 
l.146 \end{document}
                    ]
Package atveryend Info: Empty hook `AfterLastShipout' on input line 146.
 (./IUCr-article.aux)
Package atveryend Info: Executing hook `AtVeryEndDocument' on input line 146.
Package atveryend Info: Executing hook `AtEndAfterFileList' on input line 146.
Package rerunfilecheck Info: File `IUCr-article.out' has not changed.
(rerunfilecheck)             Checksum: 2F9F1442DF1B47E8BE77BE2145FE5EA1;326.


LaTeX Warning: Label(s) may have changed. Rerun to get cross-references right.

Package atveryend Info: Empty hook `AtVeryVeryEnd' on input line 146.
 ) 
Here is how much of TeX's memory you used:
 5963 strings out of 492616
 85023 string characters out of 6128966
 205285 words of memory out of 5000000
 9827 multiletter control sequences out of 15000+600000
 10498 words of font info for 36 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 50i,8n,28p,289b,325s stack positions out of 5000i,500n,10000p,200000b,80000s
</usr/local/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmbx10.pfb
></usr/local/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmbx12.pfb>
</usr/local/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmcsc10.pfb>
</usr/local/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi8.pfb></
usr/local/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmr10.pfb></us
r/local/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmr6.pfb></usr/l
ocal/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmr8.pfb></usr/loca
l/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmssbx10.pfb></usr/loc
al/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmti10.pfb></usr/loca
l/texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmti7.pfb></usr/local/
texlive/2018/texmf-dist/fonts/type1/public/amsfonts/cm/cmti8.pfb>
Output written on IUCr-article.pdf (3 pages, 136020 bytes).
PDF statistics:
 91 PDF objects out of 1000 (max. 8388607)
 74 compressed objects within 1 object stream
 12 named destinations out of 1000 (max. 500000)
 41 words of extra memory for PDF output out of 10000 (max. 10000000)

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