Alt-tabbing hangs the game

When I alt tab out of the game to do something like start a new music song when I alt-tab back into GSB none of the graphics load and I just see a black screen until I quit the game and restart. I play on fullscreen 1680x1050 with all boxes checked and windowed 1680x1050 cuts off some of the bottom of the screen. I guess I can switch to windowed 1440x900.

WinXP Home SP3
Smithfield Pentium D805
ECS C19-A motherboard
2 GB DDR2 Corsair 5300 RAM
Radeon HD 4650