We have a Mantis system which have been running for a few years, some weeks ago we upgraded from 1.0.5 to 1.1.0. It seemed to work very well. But now there is a problem for some users to login. If a new user is created, a confirmation URL is sent to the user, the user enters that web page and sets password. When pressing 'Update', it goes back to the login page. Entering the username/password combination results in an error "Your account may be disabled or blocked or the username/password you entered is incorrect.". This does also apply to some, but not all, earlier users from before Mantis was upgraded too. Suddenly they are not able to enter the system, and when trying to reset password, the same error appears. Other users enters just fine.
Any hints to where to start looking...?
Running Apache/MySQL/PHP5 on Debain.
New users can not login, but old users work
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