Looks very like Corel issue, becouse 2 versions don't works.
Actualy, I think we just got bad case - some combination(s) of Corel, Vista and drivers didn't works. Becouse same Corel versions works with your Vista, and with 4 other computers, where I can test, all they are with different configurations. One of them are laptop too, but runs XP, not Vista.
So we can't do nothing, unless to detect the exactly "critic mass" combination, to be possible to show to developers, both of Vista, drivers and Corel, what to fix. So we "just" need more testers... :-)