I burned a 2 hour video to Blu-Ray last night from within PRE9, and it all turned out well. Except it took maybe 5 or 6 hours to burn (its 6x speed disc).
Is this to be expected? I don't see any settings for burning speed from within PRE9.
I burned a 2 hour test Blu-Ray the other day from within the software that the Blu-Ray burner came with (where you can adjust the burn speed), and I could swear it was much faster. But I don't want to waste another disc just to test this out.
Unfortunately, PrE does not allow one to alter the Burn Speed. The "big brother," Encore has that capability.
In PrE, I suggest doing a Burn to Folder, and then the great, free burning utility, ImgBurn, which allows that adjustment. However, without extra software (virtual BD burner software), PrE does not allow BD Burn to Folder, at least not yet.
Sorry for the bad news,