I've created a Blu Ray project and when I click the Burn Project button (or do it from the menu selection), the "Burn Project" window pops up and just hangs indefinitely. I can't make any selections, it just stays there. I've tried creating a simple DVD project with a single video, no changes to background or anything else, just dragged a video into the project and it worked fine. I've tried the same thing with a new Blu Ray project and it worked fine without changing anything, just dragged a single video on there and the window worked fine. Once I pull multiple videos into the project where it creates submenus, the Burn Project window won't work anymore. It seems to be the submenus, specifically, that invalidate the project. Any thoughts?