I can not open (anymore) my old previously working TB8 Brain. While having the issues with TB9, I deinstalled and reinstalled it. Now it seems to be broken (TB8, not the Brain itself, as I doesn't even let me select my Brain).
I can not get any dialog on TB9, as ...
(to answer your question)
... the initializing popup stays open forever.
If I click on it, it hides (which generates the message "Disposing PopupDialog: #v6w").
After that, I have to close it via the taskmanager or CMD-Q
Just sent you a PM with the output.log