I tried changing the MTU to 1300, now I can browse the web and connect to sites with SSL, however, I am unable to send mails with SSL. Any ideas? Have you tried sending emails with SSL accounts?
(Correction, I am now able to send emails, however, they send pretty slow...)
If anyone still experiences problems, you might want to continue to lower MTU by multiples of 4. I lowered mine to 1272 before ping stopped reporting errors, though for practical purpose 1300 seems to work fine. Lowering MTU generally reduces connection speed so it's best to keep it high so long as it doesn't cause any problems, assuming that you are on broadband. Hope Apple fixes the bug...