It's very recommended to use 256x256 texture size as a maximum, just to make sure it works on any video card. Simply open your 800x600 image in some editor and resize it to 256x256. Back in PowerDraw, draw it in 800x600 size. Using 1024x1024 texture just to draw background image isn't a very good idea (you waste a lot of memory and make your application compatible only with newest video cards).

Cheers,
Lifepower

P.S. Check http://www.mor.itesm.mx/~al375780/asphyre_beta.zip (full release coming... soon )