I have just realized that when I invoke the software-boutique a window is rendered that is blank with just a frame and the title bar at the top. (This is new behavior.) The snap for the boutique is up to date as is the rest of my system. Am using the "Marco (built-in: Xpresent)" window manager, and I have tried the other options as well with no change in the boutique window presentation.
I wonder if someone here can suggest a fix for this behavior?