Hi,
Are you saying the "Enable Master Valve (#16):" is checked and when you un-check it and hit save the page refreshes but it is still checked?
If you close your browser completely and open it back up and navigate to the settings page is it still checked?
Please try clearing your browser history also to see if that makes a difference.
If nothing else works please send
support@hydroflash.net an email so they can call you to help.
Thanks,
HydroFLASH Team