Vidalia not bootstrapping to 100%

I am running TBB 2.2.39-4-osx (the latest version) from a USB
drive using the 'Guest' account of an intel Mac (MacOSX 10.6.8). Vidalia gets stuck and will not bootstrap to 100% which means I am unable to use the browser. I look into the 'Activity Monitor' app and find the entry 'Vidalia not responding' when this happens. I have tried to use the Vidalia bundle with my own Firefox but Vidalia displays the same behavior. I have tried for two days. This is the first time I have encountered this problem with TBB.

Therefore I thought this could be a bug and report it here after registering. Thank you.

Trac:
Username: Avidya