[Theme EvoLve] Error 406 Not Acceptable under theme menu

The error appear under the last 2.2.2 version of Evolve theme only under the General Styling entry in the theme options. The error itself appears when you press the save settings button (doesn’t matter if you change something or not) and is saying that the cause for this is missing options.php file (but the file is there and there are no changes made to it or any code missing). Of course if you just close the browser or try to log out and log in again it is more likely to lose access to the WP installation as it happen to me couple of times before finding the workaround. I think this is because of a code error in that particular menu, and would like to ask for help, as I am not good enough at PHP.

Meanwhile the error is fixed, here is the workaround, if this will help somebody: When you press the Save settings button and you are transferred to that error 406 page, don’t close the tab or the browser itself, just press the back button, select another entry from the theme menu(Layout etc.) and without changing anything press the Save settings button again. That will save the theme settings correctly, and everything will continue to work normally. Even if there were changes made in the General styling menu, they will be applied as well.

Any help how to resolve this permanently will be appreciated.
Thank you.