I was getting what appeared to be random failures during the code signing process with SB 7.5 under Window 7, 32-bit. At times, it would even cause SB to fail/terminate.

After some research, I have found that if I have Windows Explorer open on the default \Installs folder where my installs are built, it will fail every time. Select any other folder, and the signing step works every time.

It seems Windows 7 puts some kind of hold or watch on the folder it is displaying, and SignTool does not like that at all. I've also run into similar issues with folders being viewed simultaneously between XP, Vista and Win 7 where you can't rename/move/delete files due to these invisible locks.

Hope this helps someone,
Tom H.