Hi Charlie,
This example is actually a site that my wife is working on to learn Pro. I don’t have screenshots etc at the moment, but I will try replicating the issue on a test site and give you screenshots/video
one of the instances was a column with an absolute positioned div (background image) and an headline (ie text over background image). The div had a z-index of -1 after the update that effectively hid the background image totally. changing to z-index of zero didn’t work, changing the div to z-index =1 showed the background image but hid the text.
Pretty much every example I have seen so far of this problem was due to the background image being hidden when upgraded to 6.0.2
As I said, I’ll have a dig around and see if I can re-create the problem for you