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Is this the very first time you used it?

It does take any where from hours to days (in rare cases) for all Avatars and game icons to populate to your account.
 
Also, without wanting to sound condescending, it was the code listed next to PDX Forum {backer level} not the code for the old forum?:)
 
Avatar code troubleshooting steps.
So I entered the code on my backer page and it says that the code was already used and is no longer valid. Any ideas?
This kind of error message happens in a lot of online instances, often its a false error message.
I would;
  1. double check that you entered the correct code
  2. sync steam account (if you use such)
  3. log out and log in again.
  4. go to 'owned items' and click sync.
  5. wait for a day or two, it has been a delayed process for many .
  6. Finally, if none of that worked. Only then would I contact HBS
 
It's a bit odd, but you'll get the hang of it, just no custom avatars, sorry.