I can only think of one other possibility, a glitch that happened to me too.
Did you happen to mute an entire server via the client mute function in the main menu? The glitch appears if you do that and does mute you aswell, making it impossible to see your own messages and seemingly have you muted.
I solved it by typing "cl_mute_all_commands 0" in the console, the source is here:
https://steamcommunity.com/app/440/discussions/0/616189743031053000/
Hopefully it does help you.
Edit: Moved it from the other guys report thread. Please dont be confused by that.