[Solved] "Configuration +" settings

Hey guys, I'm tryin to change the default so a window doesnt pop up saying new PM, since it says it at the top qbar anyways...
"General Admin" > "Configuration +" > "Profile options" >
"Pop up window on new Private Message" = "no"
Hit "Submit"
returns:
... so i tried putting in a new users details since it wanted secret Q and reg a new user with the changed defaults, (thought maybe by some wild chance it'd work) and it returned
any help is appreciated
"General Admin" > "Configuration +" > "Profile options" >
"Pop up window on new Private Message" = "no"
Hit "Submit"
returns:
Sorry, your password can not be the same as your username.
Click Here to return to General Configuration
Click Here to return to the Admin Index
... so i tried putting in a new users details since it wanted secret Q and reg a new user with the changed defaults, (thought maybe by some wild chance it'd work) and it returned
"Fatal error: Call to a member function on a non-object in /public_html/includes/mods_settings/mod_profile_control_panel.php on line 1045"
any help is appreciated