I just made an important upgrade to the log in system. Migrated form an old tool to a new one that will allow for more possibilities to create an account (Twitter, Facebook, others).
If you log in to the site using Google or Yahoo you will receive an email telling you about this. That email contains a link that you should click on to make sure your account is 100% safe. Just click on it and it will all happen automagically.
I've taken extra care to make sure everything works as smoothly as possible, but there are some scenarios that I've been unable to automatically fix and need manual action.
If you're really interested in the geeky details feel free to drop me a line and I'll be happy to explain in detail what happened