When I launch the Adobe apps, they ask me if I want to delete the preferences file. I say 'no'. Then, when using the apps, none of the tools seem to work properly, eg in Illustrator, I can't move objects without it duplicating the object. Photoshop constantly displays the contextual menu icon that usually only appears when you hold down the control key.

I can't do any work in them when this happens, so I am forced to log out and then back in. They work for a while and then this annoying bug happens again.

I think it must be to do with the modifier keys (command option and control). I think Adobe's apps must think I'm permanently pressing the modifier keys down - the thing is, no other app on my machine has this problem!

Does anyone else experience this? Or have a fix for it? Any suggestions much appreciated.

Running: Mac OS X 10.6.6 on an iMac. Adobe CS4 Design standard installed.