Odd screen corruption only with admin account?

Question

I hope this is the right place to post this. I'm having an odd screen corruption issue on my Mac Pro 2.0. As the cursor passes the mid point of my midpoint of the screen, the screen will "jump" or "shift" and add a row or column of pixels to the monitor. Any text or graphics around the these newly created rows will become corrupt or appear doubled. Also the cursor will behave very oddly. When rolling over a text field in an application sometimes the arrow won't convert to the text entry icon, the entry icon will appear superimposed on the arrow icon.
At first i thought it was a hardware issue (video card going bad ) but Hardware Test came back clean. As a last resort I created a new user and voila! the corruption goes away when logged in under the new user! I'm assuming there is a corrupted file somewhere associated with the admin user account. Obviously I can't delete the user as it's the owner/admin account. Any place I can start looking where the offending file might be found?
Mark

Answer 1

Hmm, I've got screen zoom turned off so I don't think that's it. Now some of my icons are coming up corrupted,but again, only when I'm logged into my admin acct. Is there a preference file that in the user/~/library/preferences file that i could toss and see if it helps? I could always just toss the whole preference files folder after backing up and then try replacing them one at a time but I'd rather not do that if I have a choice.