It happend to me twice- with 2 gym leaders(4th and 6th) so i guess i should post it here:)
Bug description:
Ive won against 6th gym leader(Sabrina) with just one pokemon(Murkrow) Ive lvled up like 3 times in this battle and when battle ended I needed to choose which move should I forget to learn new one, since i dont need any more moves i just clicked to not learn new move. Then Sabrina wasnt even speaking with me and i couldnt move (I know that it couldnt be server crash bcoz many ppl were walking out here and i was looking at chat, there were normal discussion on Help, Local and other chats) I've relogged which was the only thing i could do, wasn't surprise for me that i had to battle Sabrina again and there was ofc no experience for my pokes.
Meaby when a pokemon is trying to learn new move while battle have ended(while fighting with those gym leaders) game freezez for a single client. Or meaby it was just bcoz we're having some troubles with servers. I dont know that and i dont need to, I just want to make it clear- I'm not complaining, it's just a possible bug report:)