very elusive ml-build issue

One of the developers on our team has consistently had an issue with 
building our main heapfile when using the $smlnj-tdp/back-trace.cm 
feature. ml-build runs successfully to completion, but no heap file is 
created. When we turn off the back-trace facility, the heap file is 
created perfectly.

I tried created a smaller file to demonstrate the problem, but I 
couldn't reproduce it. We suspected it might be a heap file size 
problem, but when I tried artificially generating a really huge heap 
file, I still couldn't reproduce it. And it only happens on this one 
machine (WinXP with cygwin).

I know this isn't very much information, but does anyone have any 
suspicions or clues that might have something to do with this problem?

Thanks so much,

Dave

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