The proper combination of hide vs show preview associated with selecting/deselecting nodes was the problem. Thanks! I now am looking at what I was trying to do.
But, as follow-ons, can you explain exactly what ‘hide all geometry preview’ means? I’m telling Dynamo to generate a bunch of colored polygons and surfaces, but it either shows them, doesn’t show them, or shows them in wrong colors, based on different combinations of ‘hide/show all geometry preview’ settings for each node. There’s no place I can go to look at all nodes in a checklist as to which ones are hidden vs shown, is there? I’d like there to be UI to clarify what I’m looking at, since combinations of per-node hide/show choices make so much difference in what I’m shown. Also, the term ‘preview’ seems odd when what it’s showing is the actual intended output of the dynamo script? How would I look at the ‘actual’ view (for lack of the proper term) of the thing that I’m currently looking at a ‘preview’ of?
Thanks again for your quick and helpful responses, Jacob!