I reverted back to 2.8.5 as well and it is now displaying correctly again.
I am having the same issue. It started when I downloaded the Virtue Child theme update yesterday. The group products will not display to be added to a cart on our website but single products are fine. Here is an example of a grouped product: https://www.goldenbarrel.com/product/golden-barrel-coconut-oil-refined-3/
Single product: https://www.goldenbarrel.com/product/golden-barrel-palm-oil/
I confirmed it was the theme by activating Twenty Seventeen theme instead and the group products then displayed fine. Its currently back to Virtue Child Theme so the site will at least look right.
What can we do to fix it?
