I have done the first few quests until I got to the part where I had to talk to Tarak Hadfield ( "Sparck's Ark"), when I realized that I had received no xp. The quest descriptions said I should get the xp but I got zero, zilch, nada. I am not going to continue until the xp that I lost is given to me. I am not playing because I want to be sure I get the xp given back before I continue on ( I want to be sure that I notice it when I get the xp).
Huh. That sound's like it sucks, but I doubt such a serious issue would slip by them. It most likely was a small bug, you should try re-logging in to see if it gives it to you. Something once happened to me long ago where I thought I wasn't getting EXP, but it was actually a very long quest with varied objectives. Hope this helps, possibly.