Disabling Fog of War.

How can I disable Fog of War on any given page? If I click on Page settings and uncheck Fog of War checkbox, the OK button will not close settings window, but CANCEL will exit leaving FOW active. I'm on Chrome 56.0.2924.76 (64-bit). Thanks

Edited 1507040815
The Aaron
API Scripter
I couldn't duplicate this issue.  Are you getting any errors in the Javascript Console?  Try closing the tab and opening it in a new one and see if it works then?
Firefox 52.0 (64) works fine. Reloading Roll20 in a new Chrome window seems to be working now.