There is no "demo pausing" in the program so it is most likely the OpenGL. OpenGL acceleration is highly recommended. The program is brand new and is bound to have a few quirks in it. It has been extensively tested and works well under normal circumstances. Generally speaking, a PIII cpu and a video card with some form of OpenGL acceleration is recommended. Konan p.s. Tutorials are coming tomorrow. I'll be spending the entire work day on them. As for tonnight, I'm gonna kick back and get some rest.