crash when making vector picture out of monochrome bitmap

CorelDraw X5 home&student crashes everytime I try to make a vector out of a monochrome (black&wite) bitmap drawing. It happens with all resolutions and jpg or bmp.

I have installed the program on another pc to check, the same result. My pc is functioning perfect furthermore (Windows XP sp3; Core2duo 2.2 GHz; 3GB RAM). My only solution yet is first to convert to grayscale or duotone.

Anyone suggestions ?