@anon42388993 I have BlackMate chosen in Appearance Preferences. The icons of the wooden disks are PNG’s I found on the net which I’ve swapped for the regular ones by right clicking, going to properties and changing the icon in the Basic tab. I’ve not loaded a whole new theme.
I’ll have a go at creating a new user account and I’ll report back what I find.
By the way, just noticed @ouroumov message and I should have said that I did update to Mate Desktop 1.14.1 when it came out. I am not sure if this behaviour existed before then.