Just an update. I got around to just re-installing my OS. No problems, it was just really really cluttered, I wanted to switch back to KDE and didn't want to spend forever removing remnants of old Gnome stuff and installing things that I found missing, so I just did a re-install and installed KDE this time around. Not sure what's different this time, same kernel, same hardware, same OS, but now the game runs perfectly, except for no sound, but it's starting up and connecting, so I'm happy. There's probably a topic regarding this sound issue somewhere in the forum here, so hunting I shall go!