[XeTeX] rangecheck in --run--

[maxwell]

One of our people is getting a crash in xetex, which I can't reproduce.  
It's very odd, since afaik we're both using the same input files, the 
same instance of xetex, the same TeXLive 2014 files, and so forth, and 
running on the same machine.  Clearly s.t. is different, but I'm not 
sure what, and this email is a query about what I should be looking for.

The error msg is:
----------
Error: /rangecheck in --run--
Operand stack:
    --dict:11/20(L)--   TT0   1   FontObject   --dict:8/8(L)--   
--dict:8/8(L)--   TimesNewRomanPSMT   --dict:13/13(L)--   Times-Roman   
Times-Roman
Execution stack:
    %interp_exit   .runexec2   --nostringval--   --nostringval--   
--nostringval--   2   %stopped_push   --nostringval--   --nostringval--  
  --nostringval--   false   1   %stopped_push   1862   1   3   
%oparray_pop   1861   1   3   %oparray_pop   1845   1   3   %oparray_pop 
   --nostringval--   --nostringval--   2   1   1   --nostringval--   
%for_pos_int_continue   --nostringval--   --nostringval--   false   1   
%stopped_push   --nostringval--   --nostringval--
Dictionary stack:
    --dict:1155/1684(ro)(G)--   --dict:1/20(G)--   --dict:76/200(L)--   
--dict:76/200(L)--   --dict:106/127(ro)(G)--   --dict:286/300(ro)(G)--   
--dict:22/25(L)--   --dict:4/6(L)--   --dict:26/40(L)--
Current allocation mode is local
Command /groups/tools/texlive/2014/bin/x86_64-linux/xelatex   
-halt-on-error -output-directory=./LinguistInABox/output/latex 
./LinguistInABox/output/latex/linguistInABoxGrammar.xetex -no-pdf died 
with signal 13, without coredump
------------

Signal 13 is "Write on a pipe with no reader, Broken pipe."

I believe the crash is happening at the point xelatex is trying to embed 
an existing PDF.  If I'm right (we're going to verify it tomorrow), the 
command that crashes is
----------
\imgexists{list_intonation.pdf}{{\imgevalsize{list_intonation.pdf}{\includegraphics[width=\imgwidth,height=\imgheight,keepaspectratio=true]{list_intonation.pdf}}}}{}
---------

Googling this:
     xetex OR xelatex "rangecheck in --run--"
brings up about six msgs from 2011, which seem to be the same thread, 
and afaict are irrelevant.

We're running the version of xetex that came with TeXLive 2014 
(3.14159265-2.6-0.99991) on Linux.

Any suggestions as to what I should be looking for?

    Mike Maxwell
    University of Maryland