Hi all,

I find myself suddenly unable to compile a LyX file into pdf (through 
pdfLateX). 
The 'view pdf' command produces a list of errors of this kind:

Undefined control sequence
}

some text from my file


so it looks like there is an unmatched brace somewhere that's causing the 
errors. However, I did not insert any ERT since the last successful 
compilation---only regular text and citations---so I don't know where to look.
Inspecting the LaTeX log does not help. At least it doesn't help me. It shows 
three control sequence erros inside a citation. They are of this kind:

! Undefined control sequence.
\...@williams2006 ...aptive Networks}.\ Ph.\tmspace 
                                                  +\thinmuskip {.1667em}D 
th...
l.2070 }

he control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


This is a reference that has been in my document for quite a while and never 
gave me any troubles. Perhaps the offending text is farther up, but how can I 
find it? 



Finally, if I export to LaTeX and run the usual 
pdflatex/bibtex/pdflatex/pdflatex 
sequence from the command line, I do get what seems to be a correct pdf file, 
although the bibtex run produces a (non fatal) error:

(\end occurred inside a group at level 1)

### semi simple group (level 1) entered at line 109 (\begingroup)
### bottom level

The pdf seems to be correct, though. line 109 of the LaTex file is part of the 
preamble, and I cannot see anything wrong there.


Any idea on where I should look to find the text that generates the errors?


Thanks for the help,

S.

______________________________________________________________
Stefano Franchi
Department of Philosophy          Ph:  (979) 862-2211
Texas A&M University              Fax: (979) 845-0458
305B Bolton Hall                  [email protected]
College Station, TX 77843-4237

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