I was having the same issue today. The last time I was here (a week or so?) I had access to the forums and was able to post; I even sent Filburt a private message at one point.
Today, when I tried to do anything short of view my profile or read posts in the lounge, I was presented with an access denied page. I reverified my account and email, triple check the address entered at vb.com, and made sure everything was entered in the proper case. Nothing worked.
Not being able to post, I couldn't do anything other than email the vBT staff to ask about the problem. Like others, I didn't receive a reply but that's understandable. These guys probably have a day job too ya know.
So anyway, I changed the email address of my account (CrashX) and registered a new account (LDEV) with the same email addres I had used previously. At that point I gained access to everything I had before.
Not sure what caused this or why it happened, but it was definitely strange.