Topic: Problem with login plugin act_as_auth...

Hi I am new to ruby and have managed a small video upload app in the past few weeks. I am using the login plugin, and I have a problem with logging in. When I signup an account, it logs in at the same time. However, if i log out and then try to login again I get an error which says :
Recognition failed for "/%EF%BF%BD/account/login%EF%BF%BD"

I wonder if anybody could help me out with that, or got a clue on how to "debug" these errors..
I've checked the log but nothing clear enough for me in there...