The problem is not the redirect, the problem is, that there happens nothing. If the username is wrong, the error message displayed is: “false user name”. Wrong PW: no reaction. Right PW: no reaction. There is some CSS included by the former programmer. Can this be the cause?
Correction: I just tried and now it works again… What is this – it works, then it does not work anymore and then it works again? Rare.. I will have an eye on it and will inform you, if it breaks again.