I have that problem after playing Soldat for +3 hours. I have reinstalled Soldat, changed my font, tried a patch install (installed 1.4.2 first then installed patch to 1.5.0), some of the other things mentioned in this forum. AND IT STILL DOESN'T WORK!
Before I get that message, my keys suddenly don't work and sometimes my screen goes partially white. It is NOT an ATI card problem cause I'm using a NVIDIA 8600GT 1GB graphics card. Also, I am using the latest version of DirectX 9.
These problems are only occurring on 1.5.0.
Does anyone know how to stop these initial problems?