FYI: The latest JellyBean build for the HTC Vision solved this issue. Both the beta and stable versions work nice with AAC+ streams :)
I posted te bug this morning (CET) so I have no answer now. I'll keep you informed when I hear something. http://bugs.andromadus.com/issues/82
AAC+ seems to be broken on jellybean when "AAC+" is displayed. When the stands "PLS" it works although it's a AAC+ stream.
What happens when it fails is that prebuffering-percentage is sticking at a number. (With old stable it says buffering 90%)
I e-mailed the details to your support address.
Customer support service by UserEcho