Jokosher crashes when deleting an active instrument effect

[Jeremy]

1. Start a new project
2. Add an instrument
3. Record something (I'm using a usb mic)
4. Add an effect, hit play (in the effects window, not the main window)
5. While Jokosher is still in play mode, select the effect in the active effects box, press the deactivate button

At this point the program hangs until I kill it. (I tried opening jokosher from terminal and duplicating the crash to see if there were any error messages, but there weren't)