Black box

Installed Mac OS X 10.4.8 on my Intel MacBook. Result: a big black box surrounds my cursor, rendering said Mac semi-useless. Screen shots: 1, 2, 3, 4. Uninstalling Keyspan and trashing com.apple.universalaccess.plist (remedies that worked for some Macintouch users) did not fix the problem. Thanks, Steve!

Anyone know a solution? Delete all preferences? Uninstall all Adobe software? Remove tonsils with pliers?

Update: The pleasant site red-sweater.com explains the problem and solution, as does an Apple technote. Many thanks to those who commented or wrote in soon after I posted my query. Eric Peacock’s comment also nicely summarizes what the black box is about.