Everything was working fine. Then I tried to install unity completions, and that was taking a very long time (ctrl+` showed nothing happening, but the status bar said it was installing). I left for a while and came back, forgot I was waiting for that, and closed the program with Alt+F4, and now the program is “not responding” every time I start it.
I’m using Ubuntu 14.04, and I installed from the webupd8.org ppa.