With same set-up (Ubuntu 14.04, gregorio version 4.0.0-release-4.0-1cc71cd-1) I 
can confirm an error if luaotfload is updated from 35328 -> 39093.

The message (with my test file) is:

(./PrefDialog-4_0_0.gtex

[... various warnings about deprecated commands]

! Undefined control sequence.
<argument> \gre@font@music \GreCPPesOneNothing 
                                    
l.33 }
    %


Reverting to luaotfload 35328 gets rid of the error.

Bernard

----- Original Message -----
From: "Nikolaus Breuer" <nikolaus.bre...@t-online.de>
To: gregorio-users@gna.org
Sent: Tuesday, 15 December, 2015 5:35:55 PM
Subject: [Gregorio-users] gregorio 4.0: trouble with latest tex/luatex  updates 
of TeXLive 2015

Dear gregorio-user-fellows, 

it seems gregorio (this time 4.0.0) can't cope with latest TeXLive 2015 
updates: 

Before installing 

[Sun Dec 13 15:40:04 2015] update: fbb (38195 -> 39071) 
[Sun Dec 13 15:40:43 2015] update: fithesis (39009 -> 39079) 
[Sun Dec 13 15:40:49 2015] update: gnuplottex (32277 -> 39082) 
[Sun Dec 13 15:40:54 2015] update: ksp-thesis (39027 -> 39080) 
[Sun Dec 13 15:41:01 2015] update: lualibs (34736 -> 38998) 
[Sun Dec 13 15:41:30 2015] update: luaotfload (35328 -> 39078) 
[Sun Dec 13 15:41:36 2015] update: luatexko (38540 -> 39081) 
[Sun Dec 13 15:41:41 2015] update: make4ht (38446 -> 39075) 
[Sun Dec 13 15:42:11 2015] update: newtx (38467 -> 39072) 
[Sun Dec 13 15:42:27 2015] update: pst-labo (15878 -> 39077) 
[Sun Dec 13 15:42:32 2015] update: showlabels (32364 -> 39083) 
[Sun Dec 13 15:42:36 2015] update: tex4ebook (38463 -> 39076) 
[Sun Dec 13 15:42:41 2015] update: versonotes (36310 -> 39084) 
[Sun Dec 13 15:42:42 2015] auto-install new: bitpattern (39073) 
[Sun Dec 13 15:42:44 2015] auto-install new: simpler-wick (39074) 
[Sun Dec 13 15:42:45 2015] auto-install new: unicode-data (39085) 
[Sun Dec 13 15:42:49 2015] update: collection-basic (33040 -> 39085) 
[Sun Dec 13 15:42:52 2015] update: collection-latexextra (39047 -> 39074) 
[Sun Dec 13 15:42:56 2015] update: collection-science (38842 -> 39074) 

gregorio-4.0.0/examples/main-lualatex.tex compiled ok, after installation 
lualatex --shell-escape main-lualatex.tex results in an error message 

(./PopulusSion-4_0_0.gtex 
! Undefined control sequence. 
<argument> \gre@font@music \GreCPPesThreeNothing 

l.13 } 
% 
? 

Since I didn't change anything in my installation ("Vanilla" TeXLIve 2015 on 
64bit Ubuntu 14.04 LTS, all with latest updates ) e xcept above TL updates, it 
's hard to believe the reason should be a general PATH or config error, rather, 
it seems gregoriotex might perhaps not be prepared for some of the most recent 
lua-related changes (?). Also complete new gregorio 4.0.0 install, rebuilding 
all formats, even today's luaotfload update [Tue Dec 15 17:41:10 2015] update: 
luaotfload (39078 -> 39093) did not help. 
Interesting side observation: gregorio 3.0.3 'survived' TeXLive 2015 updates in 
good shape. 

Anybody out there running gregorio 4.0.0 on a Linux system with latest TeXLive 
2015 updates? Any idea of what might cause the trouble ? 

Kind regards 
Nikolaus Breuer 

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