I had it the first time I went to my hub after the update, and again when I reinstalled some apps to get Hub functionality turned back on for them. Haven't seen it again since.
Is this issue only within Face10 or Facebook or within the Hub itself? I just started having this with the old facebook app and I'm not even on 10.3.3 yet... keep in mind Facebook officially cut off support from their messenger the same day that 10.3.3 finally showed itself.