Today I was generating a new GPO for configuring Regional Options and when done anytime was saved. I saw that is need to push the F5 to activate and save the change for this GPP!
Look that the config is on green colour! In red is not activated.
When you configure GPP remember to use from F5 to F8.
F5 – Mark all settings on the page as “green” (apply all)
F6 – Mark current setting as “green” (apply this setting)
F7 – Mark current setting as “red” (don’t apply this setting)
F8 – Mark all settings on the page as “red” (don’t apply).