When saving a page you have the following warning:
RESTRICT_UI option enabled in [/etc/csf/csf.conf]. Config items [...] could not be saved though the user interface.
This is because someone has set the RESTRICT_UI option under Juggernaut -> Settings -> Initial Settings. Once this is set then restricted fields cannot be saved though the extension interface.
To allow changes to be made though the extension set the RESTRICT_UI option in the file /etc/csf/csf.conf to 0.
# 0 = Unrestricted UI
# 1 = Restricted UI
# 2 = Disabled UI
RESTRICT_UI = "0"