The tails, the view of the screw threads, and then the more obtrusive ones where the whole part is transparent. I reckon they must be related, so if the Alibre folks want to look at it, then I'll show them the stuff. I'm not demanding action, and I'm kinda bored with showing it. That transparency stuff is getting to where it ain't news anymore. Showed the other part because it is a recently generated file, no possibility of it being a cross-version issue etc. Those parts were created recently, and the other parts are imported, but are all one-piece parts, no layers, no constraints,in them, no nonsense. There was some thought of it being a display issue, but I have no idea how the display would be able to cause a 1mm deep transparency, and scale it. Displays get told what to show, and where to show it, they are not generally set up to modify images in that way (but, of course, can be programmed to "mine" bitcoin).