I get it. Given this, I see 2 choices …
#1 – I could create a new custom post type instead of using a category to drive the post grid plug in. (I am leaning this way).
#2 – I could do something with WP_Query.
Thanks for the great plug-in. I’ll mark this topic resolved but if you have further advice, on #1 vs #2, it will be welcome.
I had cleared the cache. Next time, I will try an alternate browser as well to be sure. In any case, I really appreciate your help!