Logs in and sits at main chat/ switch hero

[Titanium]

Did you start the correct quest? If you're running 3-7-3 profiles, you should select Act 3, 7th quest, 3rd step in private game mode.
If you're running adventure mode profiles, you should select adventure mode in private game mode in diablo 3.

If you still have the problem, you can check the "output file log" option in settings, run another round and send us the log files for investigation.