The next time you encounter this issue, could you do "killall -SIGQUIT banshee" first before "killall banshee"? Then attach the ~/.config/banshee-1/log file to this bug report -- it should have a stack trace.
The next time you encounter this issue, could you do "killall -SIGQUIT banshee" first before "killall banshee"? Then attach the ~/.config/ banshee- 1/log file to this bug report -- it should have a stack trace.