I just reached level 45 - I was level 44 when I made the first post on this thread.

I'm stil showing progress to level 46. I guess it's possible I'll never reach it (as Shaver said), but so far I'm increasing in XP. I'll post again if I make 46...

(Edit: this comment was in response to Shaver's second comment, which seems to have disappeared. But I swear that I saw a comment about having two level 45 characters that couldn't progress any further...)