Strange rectangular artifacts on screen

I just upgraded from OS 10.4.10 to 10.5.6. I'm getting strange black rectangular artifacts that go away when the screen redraws. They look like invisible strike areas for Flash buttons. These black rectangles are very distracting and annoying. Has anyone else encountered this? I have screen captures I can send to anyone if my description is not clear.
Thank you.
LG Smith

Hi LG Smith;
Check in System Preference > Universal Access and see if you have VoiceOver turned on. This can do it. Sometime an Upgrade can change system preference for you.
Allan

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Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
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Strange rectangular artifacts on screen

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