MacBook Pro not scrolling on certain sites i.e. Wix website editor

Having a nightmare trying to built/edit a website I am creating as it is not allowing me to scroll. There is no scroll bar to the right and I can't use the keypad/direction keys/external mouse. Other websites are fine as are other parts of the website, its literally the advanced editor page that won't work. Wix say its my problem. I did all the usual delete extensions, cache, cookies etc. Any ideas? Thanks