Yeah, that's the standard "you're not allowed to do that" page...
I don't really have a clue what's going on there; I can see everything just fine. If your account has been restricted in that regard - which it may very well not have been; it could just be a forum glitch - the only thing I can see as a possibility would be posting each of your decks in separate threads.
...Then again, I can't recall that being against the forum rules, but I could be wrong since I don't post all that much there myself, and I certainly don't post many decks. (I don't feel a need to pay much attention to rules that don't affect me, you see.)
Not really sure what's going on there, but I haven't heard anything myself. I'll try to look into it.