View attachment 29765 The herringbone did not come back, but, out of the blue, the odd transparency returned, where it acts as if the "all edges" has been checked, but in fact no such thing has been done. At the same time, the HOOPS shading etc disappeared. It looks more like the display before HOOPS. But the Hoops shading etc was OK when I saved it, as far as I now, and I never made any change to the display properties. Whatever happened was NOT commanded. <edit> I checked and the selections are all correct, with "visible edges", and so forth. I had recently been editing the model, which is of a space that has a shop in it that I have been trying to work out a satisfactory layout for, to replace the current arrangement of machines. I work on it from time to time. So, I had been editing it, and saved it a couple days ago. Did NOT change any settings. Opened it up today, and a variety of assemblies that were fine last time I looked at it, were now partly transparent, even when zoomed in on them. Edit: I found another model that was OK before, but now shows the fractured highlighting mentioned in another post relating to V21 preview. Again, this was not commanded, AND it shows the odd transparency, even when zoomed in, as well as not showing the HOOPS style display. The global selection for "legacy mode" is NOT selected, so HOOPS mode should be in-use. 1) is this behavior of any interest at the moment? 2) If it is, how do I get the assembly to you without any modifications? It is a rather large model with many parts and subassemblies. Going through the constituents would be a long and arduous process. The directory it is in is large also, a couple of gB, with many versions of the model, and a large number of parts etc. Much too large to deal with adequately.