It’s easy fixed, and there is a thread in the forum with easy step-by-step instructions and pictures! And well worth a visit if you have a graphic card with 2048mb (2GB) or less of RAM!
CHECK IT OUT BY CLICKING HERE!
In the next release I will lowered the default to 1552 which is what you should be using too (Go read the forum thread)! So it should be all sorted next release, my apologies for setting it to high but all sorted now!