I'm not sure, but I don't think that this actually draws the card onto the canvas's buffer. You can test this out by doing a SaveBuffer() on your canvas after drawing the card, using DrawCard(). I really have no idea what Qcard32.dll is, but it's probably just using it's own drawing function, not DirectX like Blitz does. Then again I might be wrong, but I don't have any way to test it, because I don't have that Dll anywhere on my system. If it is actually drawing onto the buffer, then I don't know whats wrong with it, without seeing more of the code.