VirtualBox programming: I have a problem with ISession::Close()

I am trying to create my own version of a virtualbox frontend on linux using C++ with XPCOM, GTK+ and SDL. I am already able to show VM display on a GtkWindow with keyboard and mouse events. However, my program keeps hanging after calling Session->Close() just after shutting down from the guest OS.
Already tried doing the following:
- dispatching all xpcom events by attaching the nsIEventQueue::ProcessPendingEvents() to the GTK+ main loop (via timeout)
- set every virtualbox components i have used to NULL (IKeyboard, IMouse, IDisplay, IConsole, IFramebuffer, IConsoleCallback)
- including and instantiating ISession from inside the frontend class (previously passed by reference from another class)
Is there a proper clean-up sequence that i need to follow prior to calling ISession::Close()? I checked the SDK & API documentation and was not able to find any leads.
Thanks

this post seems specific to standalone VirtualBox and not the VirtualBox in Sun VDI 3. For VirtualBox questions, you should post to the Forum at
http://www.virtualbox.org/wiki/Community
HTH

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