Dear Maintainer,
steps to reproduce:
1. open boinc-manager's main window
2. open "tools -> event log..." window
3. close the manager's main window so both windows close
4. main window is now unreachable, neither from the environment's launcher nor
terminal
5. a new instance can't be started as this one is already running
Might be of importance: I noticed that event log window is is the ONLY window
that allows defocus and the main window to be closed while still active, the
other secondary windows always have focus and all need to be closed before.