Just tested and confirmed to be working on Safari. Do you have JavaScript disabled or AdBlock enabled?
Edit:
Also, Safari seems to have the biggest problem with the auto-login. For instance, I just logged in via the link on tSR and it is fine there and on the forum but the other sites still show as logged out. Clicking the Login link on tMR instantly logged me into the site though. The same applies to the other two sites.
Edit:
Also, Safari seems to have the biggest problem with the auto-login. For instance, I just logged in via the link on tSR and it is fine there and on the forum but the other sites still show as logged out. Clicking the Login link on tMR instantly logged me into the site though. The same applies to the other two sites.