Anyone else stumble into a Custom Game?

Did anyone else manage to find themselves in a Custom Game? I DLed the game thru steam, then proceeded to start it up and get all my settings tweaked. I then played 45-60 minutes of Training Mode, then decided to send my friend an Invite. I don’t remember what menu I was in, and in fact he may have been the one who sent an Invite, but at some point we were in a Custom Game / Training mode together. We could switch teams, but the game didn’t seem to be keeping score. We were having chat issues, so we couldn’t discuss it at the time. We eventually quit out, then tried to reproduce the glitch(?), but while we got into a Custom Game menu, the game said no Xbox Live servers were available at the time.