I can let you know that the new beta 7 has not fixed this issue for me, which appeared, I believe, with beta 4. Right now I can't afford the luxury of a clean install because my usual real-work system is down. When I filed a bug report it was quickly cleared with the message that it was a duplicate of other reports (in other words, 'we know about it'), so I've been hoping that each subsequent beta would result in a cure, but no such luck. I've tried all the methods listed in the forum to bring back my bluetooth but I'm beginning to fear that nothing but a clean install will fix it, in spite of the fact that they know about it.
Sandy