After I installed the latest update of the phpbb software, I encountered a weird problem where I can login by clicking on the link at the top of the page, but if I try to login using the form at the bottom of the page, it just returns me to the same page without my being logged in. I had this problem even before I installed the update, and thought it might go away, but it didn't.
What should I do?
Signatures are usually lame. Such as this one.