On Windows XP I had no problem with this. However I recently switched to Windows 7 Ultimate, and did a fresh install of DDO. Now whenever I alt-tab, and then switch back to DDO, it switches the game to my desktop resolution, and is uncentered. This makes the game unplayable, because I can't see 30%+ of the screen.
So then I increased my desktop resolution to match DDO. Of course, now I can't see very well on the desktop, so I have to also increase the size of text and objects. Alright, so far so good. Except something about increasing those made me unable to select any buttons on the character select screen. They don't light up or anything. I was only able to drag the camera around a bit, and sort of select a couple different characters by clicking on the wrong spots on the screen. So clearly that's not helping. So I reverted the text size in Windows back to the default, just to see if DDO would work correctly like that. It worked fine--except I wasn't able to alt-tab at all. Hitting those buttons literally did nothing.
Any suggestions?