I have an assembly which for some reason is no longer rendering, at all. When I open the part the general shape of the assembly shows black then once it loads it disappears completely. The models are all still there as I can hover over them and their faces and edges show up for selection (see image below). If I open any sub-assembly or part they view fine. I've tried copying and renaming the file, changing the view settings and rebuilding all to no avail.
Using Solidworks 2015 SP4.0
Any help greatly appreciated.