Today i tested my project at my sisters PC. She owns a GeForce 5700FX and the W-2113929204 and E2000 error appeared at her PC also when i tried to maximize the game window after minimizing it with Alt+Tab. Same errors occur also at my PC when i try to change resolution also. So I made some tests again with shadertest.c and i understood that if u try to change resolution or minimize and maximize the game while d3d_antialias is on u get the E2000 error. W-2113929204 error has also disapeared after turning off antialias at my project. I checked the manual to be sure that if there is a note about that, because there was a bug with antialias+shaders at 7.07, but i couldnt see any note about this. This might be a bug also.