I have created a user preference GPO for Internet explorer 10. The GPO sets the user's home page and then sets a number of the "Custom Level" security settings for the zone "internet". I am finding that some of the settings I choose are being applied while others are not. For instance, the home page I set is applied, the setting that allows users to download custom fonts ("Download fonts") is applied. However, at least one setting, "Display Mixed Content" is not getting applied. It is set to "Enabled" in the GPO but when I log on a user to test it the setting is set to "prompt" for that user.
Why do some settings get enforced while others don't? Is there anything I can do to enforce the "Display Mixed Content" preference?
Thanks in advance.