What is your current level, and what is the level of the enemies you're fighting?
You only recieve experience from enemies if you're within 5 levels of each other.
You do, however, gain experience from quests regardless of what level you are. There's a maximum you can get from higher leveled ones though, so you can't do level 50 quests at level 30 for the best experience.
Alright i just leved up before the servers went down and when they came back i wasnt getting exp so i figured it was the patch, i was fighting lvl 37 and i level 43 so thanks a lot