I have only just loaded this for the first time and I can't add content to the scrolling bar via Horizontal Scrolling->Content Management.
I read that others who use it deactivate and activate again but this didn't work either. Nothing I enter into the content form is saved. I can only assume there should be a list of items to scroll or something when content has been successfully added.
I'd love to know that I've done something wrong or missed a setting but unfortunately I don't think so.