This is an issue most, if not all solidworks users encounter. Parts or assemblies that show a rebuild icon regardless of how many times they are rebuilt or saved. Resaving or ctrl+q refrenced items usually will resolve this issue for me.
This time, I am getting something new. When I rebuild or save the upper level assembly, with the root assembly file (the one with the persistent rebuild icon) open, SW switches to the lower level file without saving or rebuilding the upper level file.
I am at a loss