Thanks for posting back with more info. I have checked this again in OSX 10.6 with Safari and I was able to register to the site, immediately after submitting the registration form I was logged into the site. I was able to visit my profile and click on the verify button to get the email there. The only part that I noticed did not seem rite was the email from the registration page. It never arrived, I'm wondering if this is the same reason you are having these problems.
Please post back with a copy of the registration page as it is currently in a zip archive so I can compare this and check on it further. In the mean time you should try removing your registration record and try it again with a different browser and or different OS to see if you get a different result. It seems that David and I are now getting the same valid result when testing this.