If you have updated your core and had to alter your accounts table and add collum MUTED, then you also have to change your Index.php of your account registration page. (in my case i use simpe spora. But all others pretty much have the same concept)
open your index.php and find
now all you have to is change it to look like thisif(("INSERT INTO `accounts` (`login`,`password`,`email`,`lastip`,`gm`,`banned`,`flags`) VALUES ('','','','','0','0','')"))
so add everyting you see in YELLOWif(("INSERT INTO `accounts` (`login`,`password`,`email`,`lastip`,`gm`,`banned`,`flags`,`muted`) VALUES('','','','','0','0','','0')"))
And it will work.. I had a bit of problem myself and after playing around with it , works fine.
good luck