I should have replied with my solution earlier...

Something with the video refresh rate was screwed up, and it doesn't make a damn lick of sense, but I just changed the resolution from 1600x1200 to 1024x768, then back. This solved my problem. I also am not using a certified video card, but this is the first time in over two years that I've had this problem show up.

Anyhoo, chalk this one up to the WTF solution column.