Hello everyone. I was wondering if anyone out there can help me with a tile engine problem I have been having. Usually when I run into a problem I keep at it myself until I figure it out, which has worked out pretty well until now. For a week I have been trying to figure this out and my patients is at an end. I have designed a overhead square tile engine with direct X which works beatifully, with the exception that it's scrolling is very slow. I used Directx clipper function, which is what slowed it down. To improve the speed I changed my bit blits from system memory to video memory, and this makes the speed satisfactory. The only problem is is that the bit blits don't appear as there suppose to. I only get half the image, or close to it, with the remainder of the bit map black, so that I get a zebra pattern. I assure this is because my video memory on my graphics card is non-linear. How do I fix this problem.? I might be wrong about the non-linear thing. It is just a guess on what I have been reading. Can anyone shed some light on this setback. Im almost finished, and am anxious to get started on the actual game. Thanks for your help!