I was speculating. Going back to pre-OSX, behaviours like that would suggest there's not enough ram allocated to the app (or compatibility issues - possibility of clashing with another file.) It could be a technical issue. Have you tried running all the mac & 3rd party utilities you have to completely check out your system? (Recomended are Norton Utilities & DiskWarrior & perhaps TechTool Pro. Don't forget the mac utilities.) It's been an issue for some time, have any other apps had any form of even small, almost forgetable problems?