Fantastic, many thanks.
I now understand that the background for the attributes browser was varying because it’s linked to the light/dark mode of my mac, So, setting my Mac to Light mode makes it all visible and all is well. I had remembered somehow that the background colour could be set within Tinderbox, but that was obviously just the background in Map view. Perhaps it’s a tiny bit odd that this one area is hooked to the Light/Dark mode? !
I do love Tinderbox, and its basic kindness in not forcing people into categorising, so any quirks are readily accepted.
Mark, thanks for the TbRef link. I now know where to find it.
All the best
Thomas