ALT+TAB=DC

When I was playing in the beta this weekend, whenever I alt-tabbed, I would get disconnected from the server.

I've had the same problem for a while now. It happens when I change resolutions, too.

I've had no problems neither while Alt-Tabbing nor when changing resolutions at all. Maybe your PC is too weak?
Post specs :P

Sounds like the game might be "freezing" like, a crash in your video card drivers or something. Make sure you have the latest video card drivers, and what video card do you have? Well assuming the way they made their game is 'normal' anyway. Which so far with the bugs, I'm guessing it's sorta thrown together willy nilly so who knows.

I'm dc'ing when I alt+tab aswell.

Checked drivers and other things with no success.