I know, I know, that's a horrible description ^

Only I don't know how else to put it. Since the last commit (at least I didn't notice it before), precomp crashes or exits before completion when there are more than one instance of the program working in parallel. It seems to me that the problem is related to some kind of racing condition with the temp files. Sometimes i get an error like this:

29.13% / ERROR: Access denied for ~temp000000092.dat

It doesn't happen when the same file is processed alone.
I don't believe also that it has anything to do with my hard drive because the issue appears when I'm working from a ram drive too.