Thanks so much Kevin but before I read these, I installed that little program (
WhatIsHang) and it's GREAT. Sigil hung again and the program captured everything in readable text (almost entirely) and created an 87kb report, which I copied into Metapad and zipped and sent to you as requested. It named an api call as the culprit, and I saw similar language in the bits of readable text in the original dump file. I will hang on to the dump in case, but I'm hoping the file I sent will shed light.
Thanks again for helping!
EDIT: If for some reason the .dmp file is easier for you using debug or python tools, just let me know and I will send it zipped as requested. The WhatISHang file was pretty complete though to my novice eye.
EDIT2: For anyone following the thread Kevin requested the original dump file to see if it jives with the WhatIsHang data. I've sent it off.