Under XP and Nvidia 8600GT, I discovered that 3319a windowboxes video: neither 2911 or 3516 do that.why dont you just use version 3319a for now? it lets you play BD+ off the HDD
2911 works for the majority of titles, but those with a spinning wheel at the beginning (net accessing?) crash PowerDVD. 3516 works for those titles that don't work under 2911, but it has its own issues.