I've run across this when images in the editor are too big for VP. I have no idea why this is, but if they're over 1000dpi they seem to fade, pull or smear.
Look at the original playfield image and see if it's over 1000dpi. If so, this might be your problem. If not, reset your graphic card to a lower setting THEN go back to the original setting. this sometimes also fixes these problems.
Cheers.
PS: Copy and paste don't work quite right; just IMPORT images instead and you'll end more headaches than what you have.