Ha. Weird stuff. After deleteing the folders, then trying to uninstall the Regular Labs components I was using, the library reinstalled itself - but everything else when away. What an adventure this is turning out to be!
I think there's some other conflict. The site is simple and I may try it in Cassiopeia - which has rescued me a couple times now on sites I have pushed along since the 1.5 to 1.6 debacle. It doesn't need the framework.