When I log in I often see the message "Thank you for logging in dilute.. being redirected.. etc" but then I am not actually logged in.
Try clicking remember me, if that fails clear all cookies then click remember me and try again. Also check to make sure the url is as it should be incase your trying to log into a phishing site.
I think the "database" issues might be one logical explanation. You can try logging in, after a couple of hours if, that happens.