Save Settings

Hi, I have the free version. When I want to use options such as enable preload caching, I enable, hit save settings and the option is saved. However if I come back to that page, the option is back to disabled. Same happens with URL Query Strings etc etc. I see the settings updated button….but when I go back to the page, the options are disabled.
I have tried using various browsers – no change.
Any ideas how to fix?
thanks