3
           
            
                
     
    
    ok, there is a bug in the edit user form.
(my version is hacked which is why it worked for me)
to fix:
open modules/system/admin/users/users.php
find:
 if (isset($url) && $url != "") { 
            $edituser->setVar("url", formatURL($url)); 
        }  
replace with:
 if (isset($url)) { 
            $edituser->setVar("url", formatURL($url)); 
        }  
save and you're done.
(will report this on the XOOPS tracker for you)