I'm having a problem with my WordPress installation. I'm trying to move it from one host to another (switching hosting providers for my sites). I was following the instructions given here, and everything went smoothly except for one little thing: I can no longer access the dashboard.
Similar to this (unanswered) question: moving server can not login
The site works, I can see all the posts, all the uploaded pictures, all the comments and tags - everything is there and available. I just cannot access the dashboard. Password recovery didn't help, and doesn't seem to be the problem. It doesn't complain, just clears the fields when I click "log in" and stays on the login page.
Note that the domain name doesn't change, I switched servers, but the domain remains the same.
What could be the problem, and how to solve it?