I can enter the game but not enter any room. There's no any error, the loading just stuck. Screenshot: I tried clear the cache but it doesn't help. Please help!

I did lvl up from master coporeal to the next rank and refreshed the page, then i lvld down so i lvl'd up again and then refreshed and now i lvl'd down and lost 300 exp! Is this bug? what i need to do?