I’m not sure what happened, but I can’t see my XP bar anymore. I can see the one for reputation, but no XP. Anyone have an idea of what might have happened?
UPDATE: Wanted to reply here. I had to reset the GRAPHICS settings completely. Bar showed up immediately. I tuned them back to what I wanted them and it remained. All fixed!
Xp bar disappears when you reach max level
if you have elvui, is it enabled?
I’m doing early access (just got to Khaz) and I figured it would show up now since it’s showing me earning XP.
It also wasn’t showing during MoP.
Did you turn off xp gains at some point? That will cause it to disappear.
Have you gone into edit mode and poked around? I know at one point my rep bar was covering up my xp bar.
This happened to me the other day. I think it’s a UI bug.
Anything you did to get it back. I tried disabling extensions but didn’t help.
this is what I was looking for. resetting the graphics was just the thing I needed. 
That’s why I gave the update! Nothing worse than finding someone had the same problem and they post “All fixed up, thanks!” with literally no explanation. Haha.
Glad it helped you.