I often have difficulty throwing mudballs. It just says itam not ready and makes an unpleasant noise. It lasts a few seconds. I don't have any lag. It eventually works.
It's definitely still working for me. I've been doing the event quests and dolmen runs daily to level up my 7 alt characters, and the progression per day hasn't suddenly dropped for me.
PC(Steam) / EU / play from Melbourne, Australia / avg ping 390