my two themes, Minimalism and Moonlight by Gef, both the start buttons are gone... what can I do to get them back?
Well, that would depend on how they got gone. Easiest way is to redownload. Unless they have been deleted, they can't really be "gone". Maybe just off screen? In which case you'd need to open the object navigator and change the X and Y coordinates for missing items to bring them back into your screen. Do this in builder mode and then save changes. While in the object navigator, delete the systray, since it doesn't work. But ONLY the systray, as you will be asked if you want to delete all child/parent objects (or related items) too, but choose no.