Quote - The entry link works just fine.
You can also go through the green 'Challenge Page' link at the top of this page.

I get the same error when trying to use the challenge link, Challenge Page link and can't see it on the Open Contests page.

http://www.renderosity.com/mod/contest/index.php?contest_id=1163 - You do not have permission to do this.

Is it working for anyone?

P.S. I am able to access last months Entry Page so I guess its not my account that is the problem.