Some bug reporting for you here. I'm on a Macbook pro late 2013, OS 10.9.5 and running GecoMidi 1.3.0. After running a session with Logic 9.1.3 a few times after quitting Geco, the app is gone from the activity monitor, but the icon still shows up when toggling through applications and it seems to prevent shutdown and /or logouts too, requiring a manual computer shutdown holding the power key down. If i pull up the force quit window Geco shows up there but I am unable to quit it. It is as if some small part of the program is still being seen as running after the main part has quit. After a restart and just loading up Geco it's no problem and will quit as normal. I haven't figured out yet if the problem is related to some interaction with Logic but will experiment further.
Issue #49 new