I tested it out, and the Oekaki's definitely still working...
Sooner or later I'll take a look at the code and see if I can integrate the membership functionality with the forums.
In the meantime, membership still has to be manually approved by me. To make this process a bit easier, go ahead and post in this thread if you're having problems with the Oekaki, specifically in getting an account or logging in.
If you don't have an account, go ahead and register one then PM me, and I'll approve it. If I see a new account request and I don't have a PM regarding it, I might deny it if it looks fishy (like a spam bot just automatically registered one or something), so make sure you message me if you make a new account. You can also reply to this thread, and I'll be notified via e-mail.
