kressden

Has anyone ever heard of this one?
I was on a mission as a sk, ran the whole thing with a bunch of level 35's and got no xp for it. Finished the mission, everyone got the mission xp, but me.
For about a week after that, I couldn't get any xp for anything I fought. I called for a couple of petitions, but never got an answer.
My xp finally started coming back after I sk'd with a level 28 tank.
Any ideas?