I am a beginner in Blitz 3D but i know a bit more about Windows. and for me the problem is not Blitz but windows. Specialy Combination windows and Graphics card. You say this wil happens after you opend you program a couple of times. Windows don't like to reserve and free up memory to the same program again and again. There will be a memory fragmentation between windows and the graphics card. Normaly you get a warning can't created memblock. But if the fragmentation is to high your color depth wil not work anymore. Your program gets a error back and reports that it cant create the graphics mode you requested. You can test this by simple restart windows. Its clear out the memory. If you application starts after a restart windows then this is the problem. If the problem stil exist after a restart then the problem is not windows, and i can't help you either.
Unable to Set Graphics Mode
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