When I use the "Isolate" options from the OpenBridge Modeler, Bridges > Units > "Bean Layout" or basically any bridge Units i.e. Wingwalls, Supports etc. they do not display. It appears they isolated units is there in the view if you make a selection set it will highlight but is is invisible. If you clear the Display set the bridge displays properly again but the "Isolate" for bridge model units is not working. I have checked graphic group settings/toggle not effect, display properties i.e. wireframe vs rendered but it simple is invisible in the view. I actually get the same exact effect when using the MicroStation "Display Set" tool from the right click menus or from the View Tools ribbon.