Mouse cursor jittery when hover state on browsers in OS X Lion
Since this seems to persist, you might need to perform some more troubleshooting to narrow it down:


Test by creating an entirely new user account on the Mac with the problem and see if the issue is repeatable.
Log when and where the issue happens (assuming it's not a 100% guaranteed item that you can make happen any time you want in 5 seconds of setup).
Install a clean OS onto an external USB drive and see if that setup has the issue.
File a bug or work with Apple to isolate the issue further.


The clue that the screen recording is clear, but the artifact is visual seems like a great thing to capture with a video recording of the screen and a simultaneous camera recording of the image from the screen. The frequency and placement of the issue might be enough for someone else to diagnose a likely culprit.