I used Stadium for the screenshots, but it's happened on Canyon and Valley too.
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Main Menu - I don't have the problem here, oddly enough.

Paint Editor - This is where I first noticed the problem. It goes away and I'm taken to the normal painting screen once I click on "Paint!". It's way less extreme here.

ManiaPlanet Home - Happens here too. Sometimes I can see the outlines of what looks like some kind of buttons, but it goes shined out by the glowing too quick for me to see what they are.

ManiaPlanet Store - More glowing! It happens on the rest of the menus in the hub, or whatever the proper name is for it.
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It makes selecting other packs/titles from the hub a pain, and I'd really to try the user made stuff! My drivers are updated, and the game certainly runs fine. I don't have any issues on other games, and I remember this working fine before. I did a clean install, made sure I didn't have any addons or modifications. I messed with the graphical settings too. I've tried everything I can think of at the moment.
I'd be really happy if anyone knows a solution, I've been itching to get more involved.