Comment 2 for bug 1624910

This seems to be related to this bug https://bugs.launchpad.net/ubuntu/+source/gthumb/+bug/1327002

Running `ps aux|grep -i nautilus|grep -v grep` showed there was a process running called `nautilus -n`. This instance seemed to somehow be blocking additional instances from launching. After I killed this, I was able to launch Nautilus as normal via the Gnome launcher and via the command line.