I've never gotten Encore to successfully burn a Blu-ray either, so I just create an image file (.iso) and use ImgBurn to create the disk.
ISO files also works for me, but that's not what I paid for.
So far I use just the previous version CS5, but hope at some point to get CS6 to work.
Yes, I know.
A lot of users have already approached, but it seems not to have led to a solution.