It seems that for me at least the only dependable method to save a subassembly back to the library is to use Database Explorer. I have gotten the interface option to work on occasion but not with any kind of dependability. Had the occasion to try it again this morning and thought that maybe some of the updates had addressed this but if that is the case I am definitely doing something wrong as I am having to save the modified sub through the Database Explorer interface.

Anyone else have this issue?