17th October 2016, 11:37
Oh, it's just ridiculous. I just checked that VM's "About System", & was shocked to discover that this VM Maui is now Plasma 5.8.1, ie, despite my best intention of this VM experiment only changing one variable, actually two changed, hence once again it's impossible to conclude which change fixed the AM. Curses! [And rubbing salt into the wound, my "real" Maui is still on "only" 5.8.0].