WPRentals

Hi, I have recently bought WPRentals and I want to use it as a single owner user. It has that facility. However, the WPRentals theme options section has many options. None of which function since any attempt to save changes just gets a continual rotating symbol leading to the need to refresh, click on reset settings, at which point it reverts back to offering a chance to save changes. Repeat.
Any ideas why?