i have the same problem sometimes, but only when i load my sprites (not even using paste image), but that's only when i do sprites. other than that, i have no problems. i've got windows xp pro, i've heard that (even with the 1.13 patch) your screen will flicker some using this particular os. what os are you running? another thing that might be wrong (like mr program has mentioned) is your video card. correct me if i'm wrong, but isn't db a little bit geared towards nvidia's cards? i'm using an ATI card and i think that what might be causing some of my problems.
You're ate up like a soup sandwich.