Problem with the new BufferDirty() command

Blitz3D Forums/Blitz3D Programming/Problem with the new BufferDirty() command

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Hi,
I´ve started to use the BufferDirty() command since it allows my fullscreen apps to minimize/alt-tab without losing the image in question.
Thats VERY nice!

But on some computers this doesn´t work at all, for some reason I can´t figure out. I run the exact same exe.

What could it be? Does the command require some feature of the graphics card perhaps?