If I remember correctly it happened while using the move brush; anyway, now that I found the batch file, whenever something like that occurs I will send the log to you right away.
It's just a speculation, but I think that it was probabily due to an excessive poly count. Time will tell, I guess.
As for the crash during the save, luckily it wasn't the first time it happened so I got used to it... another time it crashed, asked to save the project and the resulting file was... a corrupt obj. Oh, well...
