to stop clogging up the forum with my posts,
I will just add to this one as I encounter weird stuff as I do now and then.
Coloured shadow catcher planes adding colour to the lighting?
mostly they end up default grey so only noticed this recently.
another one with Daz studio .duf scenes in the 8.5 beta
if you delete stuff in studio they will fail as Carrara looks for the data for the deleted stuff and does not find it.