Comment 4 for bug 120337

I've just installed boinc myself, and when starting boincmgr, I get the same error dialog:
"""
Authorization failed connecting to running client.
Make sure you start this program in the same directory as the client.
"""

It appears you have to go to "Advanced => Select computer..." and chose "localhost" with an empty password there.

Please note that the crash itself is something different and looks like bug 150318.