Just was playing the Beta 2 build and had to look up a phone number in another program, so I alt-tabbed out of Dark Avatar. I was probably out of it for about 10 minutes. When I alt-tabbed back the music came on but the screen went black. After a few minutes a little window came up and said "invalid call". I used to task manager to force quit DA because it just hung on the black screen with the music.

I think I remember something being said about alt-tab switching being a problem with the earlier beta builds but I don't know if it's supposed to be working now or not.