Do you have a GUI card in addition to the 285, or do you have your GUI display connected to the 285 card?
I’ve never seen an error message like that. Can you give us the exact error message, and where you see it, i.e. at application launch before logging in, or after you’ve logged in and are doing something with a project?
What version of OSX are you running?
Dwaine Maggart
Blackmagic Design DaVinci Support