Problem checking File Types (CDN)

Dear friend,

I have used several cache plugins and I must say that WP Fastest Cache is by far the best one. I am using it in all my sites and it works lovely but in my last site I don´t know why, when I setup all the files in my CDN Settings, changes of the file types checked are not saved and all the files are unchecked. Therefore I have to remove the integration, I can not use it. I am using https in this site, is the first site I use WP Fastest Cache with SSL. Thanks in advance.

Kind regards

Guillermo