When creating a new connection, the "Test Connection ..." button becomes enabled as soon as the Server Host is input, but won't work until 'next' or 'back' button is pressed (fails with error "Bad URL: null"). Similarly, if one is on the last page of the new connection wizard and presses back to, for instance, change the password, the change is still not picked up unless the next or back button is pressed.
I haven't been able to compile the source but I wonder if the attached patch might fix the issue.