Problem with control and enter not working

I invited one of my friends to PMU and he says he cant’ do anything. I logged on with him on and it seems that he can’t attack or pick up items. Does anyone know what’s wrong?
BTW the forum is very laggy, is it just my computer?

My friend reinstalled it and it still didn’t work.

Did he say anything about “Level Up!” being all over his screen?

He did have that problem, but i showed him the related link (someone else with the problem) and told him the reinstall it. He did, and now the level ups are gone, but he still can’t move.

Use the correct words cuz u said move >_>