Agiovine, did you ever get your problem resolved? I Have the same issue. I tried changing themes and deactivating all the other plugins and still can’t get a save button. It’s really annoying!
Brubrant, I have thought in the past that the plugin favors the more effective banners. In that case, new banners might not get displayed. You could try shutting off the existing banners and adding them back in as brand new.