iPhone Safari Passwort Manager / Cookie

Another option to solve this problem is to edit the permissions of the Cookies.plist file. For some reason, the ownership of the file is 'root' when it should also be 'mobile'. I entered these commands into Terminal and it solved the problem.

chmod 777 /var/mobile/Library/Cookies
chmod 666 /var/mobile/Library/Cookies/Cookies.plist