Parental controls won't change to "Allow All" Unrated TV and Movies

I set up parental controls simply to limit accidental or possible guest purchases, however I kept getting asked for my PIN when just trying to watch TV.

On further investigation, I figured out that under Set Ratings Limits, both “Unrated TV Shows” and “Unrated Movies” were set to [Block All].

Okay, simple fix, right? I change both settings to [Allow All], hit the back button on the remote… but when I return to “Set Ratings Limits” again, both are still set to [Block All].

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Parental controls won't change to "Allow All" Unrated TV and Movies

Parental controls won't change to "Allow All" Unrated TV and Movies