I actually looked at the error now, and it complained about my d3d9.dll file. The error disappeared once I changed it, but the game still refuses to render after I've alt-tabbed from it. My OS and video drivers are really bugged, so it's quite possible for that to have something to do with it. Jitspoe, try to see if you can get the error with the opengl32.dll file I emailed you (date: 22.07.2011).
Trying to go to window mode after it stops rendering won't work, but I can minimize the game just fine if it's in window mode before alt-tabbing.
Ati Radeon x1900xt