(Copy pasted from customer support forum)
No longer able to choose a character on the forums, and thus cannot make posts except on my phone which has this character selected. The message “You need a level 10 character to post on the forums.” appears at the top of the screen. Character select does not show my characters, only my account name. Clicking on it refreshes the forums and nothing changes.
I have tried logging out and back in as well as changing my Bnet password like the support article said.