Tried again clearing the entire folder. Nothing. I looked at that Picture Cache setting in Preferences and it's at 500MB but I think that's just the size of the folder allowance before things get deleted automatically. Don't think that will do it.
IDK... I think I've got two options here. Do not turn off my computer until I have completely finished adding the transients, done the stretching and rendered the audio or try X1 and hope it is more stable. I never touched audiosnap in X1 so I have no idea.
Anyway.. thanks for the input, guys. I did learn some stuff here... just didn't fix my problem. After I closed the project and shut down last night I got this sinking feeling that I should have left the system on. Oops. Live and learn.