From PMEase forum:

#1: I did this, and I was able to direct my quickbuild to use d:\temp. However, when I started QuickBuild, it immediately deleted and recreated the d:\temp directory, hosing another task that was also using the same temp directory.

This is not cool.

Workaround is to create a d:\temp\quickbuild directory and point quickbuild to use it instead.

#2: If another process has files open in the d:\temp directory as described above, QuickBuild fails to delete the directory and goes into a hosed state. On my test system, I am using HSQLDB, which puts files in %TEMP%, which points to the same directory to which I pointed QuickBuild to use as its temp directory.

QuickBuild has to be running before I can change the setting, and I can't start QuickBuild because it depends on HSQLDB. I had to reinstall QuickBuild to get out of this scenario.