Cant save edit made in pages with "Content Builder" by maffin group

I try to edit the ready made theme pages to add my own content, and the changes are not saved. If you log in as remote support and open the frontpage, ("SEO" page in Page's) and click to Edit that page, any change you make inside Page Options are not saved.
Is it something wrong with my installation?
The theme im using is the Be Theme, from ThemeForest.
Ive tried creating a new page and after i add content with Post Builder it doesnt get saved. If i use visual composer plugin it works fine.
Any ideas on how to resolve this issue?
Thank you very much for your time,
Kind regards,