I had the same thing happen after playing one of those slot machines games. I was logged in and all, just said it did not register my score. Spent well over an hour mindlessly clicking the spin button. Thankfully, I was watching the basketball championship games and didn't pay much attention. Just clicked ~every 5 seconds.
Still a bit annoying, plus I could have strain my clicking finger ligament for naught!
So much more positive enjoyment with the Arcades then the few bits of annoyances!
Brian