Hiya,
If you still miss characters here on the forum (to choose as an avatar), please try to log out and log back into the forum. If that does not fix this for you, please try updating your account password completely. Doing so forces an account update, which can help clear this up.
I do need to mention that the above steps have not fixed this for everybody though, but we have seen a few positive results. If you want to continue reporting on this (if it does not work for you), please do so in this thread to keep reports in one place.
Have a few seconds to spare? Let me know how I’m doing!