If you do not see your helmets on your characters, please run an armory update (https://dl.dropboxus...Click piece.png). Once it is on your character, the cache should invalidate and it will appear under your name on posts.
If the helmets do not appear after an armory update, then it is one of the following issues:
bnet is down
The character is still in the queue to be updated from bnet. We invalidated all characters, so our worker is still churning through all member characters.
There is something wrong with the syncer to bnet such as a change in the data format.
If the helmets do not appear under your name, but on your character, please reply on this thread. This way we can see why you did not invalidate correctly.