Can't switch out of foreground application after Leopard upgrade

I installed Leopard on a client's MacBook I'm having the strangest problem. About 10 minutes after boot, I won't be able to leave the currently active application. Clicking on the desktop or the window of any other app doesn't do anything. Further, I can't launch apps when the computer gets into this "mode".
The first time this started happening, I decided to wipe the hard disk, reinstall leopard and re-build the home directory. Even this didn't fix the problem.
The computer is useless as long as this keeps happening.
Has anyone else had this problem?

I tried resetting my username and passwords to one that is unix-friendly as suggested above from the closed thread on this same issue from 2007, but when I tried to right click, I couldn't get the "customize" icon added to my toolbar. Anyway, the above solution didn't work for me, either.
I am totally new to the Mac environment, so have been researching this problem for several hours now. Before I try to reset all the printer drivers, I have a totally newbie question that makes me feel really dumb, but: given that I have OS 10.4.11, what OS worked well for you, and what is the version that associates with a working printer driver? ? I think I'm on Tiger. . . but maybe I'm on a wildcat? Is there a way to When I go to system preferences and check accounts, or I look at software updates, it tells me what version I've downloaded, & etc., but I can't seem to find out what my OS is named. Is there a way to do this?
sigh
thanks,
Jeannette

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