Well, I updated my blog to Phoenix, and that went smoothly enough. And then I updated MySQL to version 5.0.something, and everything seemed to work well, until I tried to make another post.
Now I can't log in.
I can create a new user and then I can't log in with that one either.
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So you can access the backoffice? (because you've said that you can create a user)
Do you get any MySQL error perhaps?
There are issues with MySQL 5 strict/traditional mode. If you have access to your DB try doing the following query:
What does it say?
If it says "TRADITIONAL" or soemthing else non-empty, you might be able to fix it by hacking /evocore/_db.class.php and putting
at the end of "function DB" (the constructor).