I opened up IHUB and my mailbox has one message. Rather than click on my mailbox I went to one of the boards that I normally read (Tate's) and saw that there was 1 message unread.
I clicked on the "1" and read the message which coincidentally was to me. I then clicked on "favorites". Normally when I do that, the (1) in my mailbox would disappear (because I read it and it was a public message) and the (1) on Tate's board would be gone also.
Both were still there! I clicked on my mailbox and the message that I had was the one that I already read!
I went out of IHUB completely and went back and the same thing happened.