Comment 5 for bug 784574

I don't think this is limited to having gedit in startup applications. To reproduce this bug, all I need to do (in a Unity desktop):
1. Open gedit from the terminal, unity search, or a unity launch desktop shortcut, and
2. Open a text document through nautilus.

Nautilus will open a second instance and all documents opened through nautilus load in that instance. Repeatedly calling gedit edit from terminal, using alt-f2, etc all re-activate the "unity instance."