Today there was a problem with friends lists. My kids tried to put their dad on their friends lists and it worked, sort of. He appeared on their lists, but when they tried to teleport to him it said that he wasn't on their lists.
Logging out and back in again took him off their lists completely.
Also, I've got the Crystal Grove bug. It won't let me in. Could all this be because the game was so crowded today? That was also causing me some impressive game lag.