>>Does your monitor have a degauss button or a something in it's "setup" mode to do that? You might want to check if you have something with an electric motor (or someother kind of magnetic field) near the bottom right of your screen. Telephone, pencil sharpener, etc...
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>Speakers that aren't shielded properly are possible problems, too - moving them away a few inches often helps.

Hey, thanks guys, gimme a big "duh", hadn't thought of that. I moved a "surround sound" speaker next to the monitor just a few days ago, in fact. I'll bet it's more than coincidence with this problem. Will check it tonight...