Infocenter all black
 

If I change the opacity of the window, I can see the boxes were the Tabs and Buttons would be, but also those smaller boxes were the buttons would be are black.

I tried a fresh install and no luck.

If this is any clue, my entire EQ2 window is also black if I go to window mode.

No idea, something is obviously very wrong. rerun the EQ2 patcher and do a full file scan. Delete the ProfitUI folder and reinstall. Something like that...