Attacks do not work anymore => Cast on Critical broken? (bug ID 3.027.718.193)

All of a sudden, my attacks didn't work anymore, right after my Cast on Critical went off (but that may be a coincidence). None of them. I didn't die, because I was in a T1 map and the mobs were too low to hit me, but I myself couldn't attack.

My mount (that I called after deselecting some buffs) could still attack.

And even after I deactivated all my spirit-buffs I still couldn't attack.

I went to selection screen, selected the same character and then it was solved. Even when I reactivated the buffs the attacks still worked.

And they kept on working, even after Cast on Critical went off again.