We have received several messages from people who simply haven't read the first news post that I posted here. Your old login will not work on the new site. The old forums are still active under the "Community forum" Tab. You old details will work here.
Over the next couple of days we are going to recreate the forums in the new site but everybody will have to re register, unfortunately. It does mean that we can clear out some old accounts and keep everything in one place. It's to benefit everybody however, it will take a little more work.
Registration is currently disabled but will be available shortly.