Before I try entering this as a bug…did anybody else have to reset the custom material shaded background? After installing I suddenly started to get this problem:
You mean the custom emap used in Shaded mode is not found and the local address is displayed in text on the model right? I think this is different than the post you referenced where the user had made custom textures so I wanted to double check. If it is the default shaded mode material emap that goes missing, I have been seeing this a lot too. I have not found a reproducible case to file it and restarting Rhino WIP fixes the issue. Still hunting for a way to make it happen.
Yes you are right. My solution was to go into the Options|View|Display Modes|Shaded page and reset the custom material, but I should have tried a simple restart. Like you, I have been unable to reproduce this problem. I am updating the WIP on my second machine and will see if it goes missing there. I have noticed that the last WIP update wiped out a number of my settings (e.g. not turning on grips with every selection, etc.).
So I guess I count as a second witness that something might be amiss, but until I can reproduce it I hate to file a bug in youtrack that basically says, “There might maybe sort of be a problem maybe kinda.”