I have seen people complaining about this issue on other forums - lots of phone models and car models are affected. My bluetooth was wworking perfectly for hands-free calling prior to the Gingerbread update. Bluetooth stopped working the day I received my Gingerbread update last week. I've tried everything I can try. Apparently there is no resolution to the issue yet. Verizon tech support could not help - they told me to contact HTC. HTC tech support had no clue. I want to revert back to Froyo, but apparently that's not possible either. I am VERY frustrated. I loved Android, but bluetooth in my car is a very important feature for me. Might be time for an iPhone...
If anyone has any solutions for this issue, please let me know. By the way, I have read in other forums that a factory reset does not work - it keeps the same phone software. It's something that changed in Gingerbread that is causing the problem. I would love to get rid of Gingerbread.