I'm having difficulties too. I can log in, but after each post, I'm immediately logged back out again. For a while, I wasn't even able to do that much, but after requesting help from the nice people at the Realms of Evil messageboards, I followed their advice and cleared my cookies and I can at least log in again now- albeit for a catastrophically short amount of time.
This isn't because of the cyberstreet glitch, either- I go straight to "enworld.org/forums" every time- I just can't seem to maintain the logged-in state any longer than it takes to post. This is a relatively new development, within the past month-and-a-half at the longest (I'd be more specific, except I have a tendancy to lurk, so I don't know exactly when this started happening). Before that, I could stay logged in indefinately so long as I visited ENWorld often.
What gives? Is there something I'm doing wrong? Is there anything I can do to correct this annoying problem?