I had old waves v8r versions not opening in Platinum 1a Braintree, in fact Braintree would not open when scanning waves plugs, it would freeze up....I had to remove v8r and install the new Waves v9 to get things working with them....Just a few days ago...all of a sudden that which worked, did not.....ahhhha....
Then the ilok thing, and the update, and fix, for some parties no longer use this method of ilok authorizing...run get new thingies for usb authorizing, go do..try to find...get things muddled, and then , tech support.....Whoo!..Remote viewing my system and specs..why?....Because the new did not work either....New driver hunt for audio A & H ...FOUND ONE...Oh thank God for updates, and continued support there of...Yah baby!....Waves plug needed a usb drive stick...it does not work with usb external drives, or Ilok anymore....Moe money!
Also UAD older version v6, now also updated to UAD v8, loaded up also, and now work , which would not authorize in Braintree, when selecting them as old version 6 .
So I would believe the opposite of new Daw, to old plugs, might play a roll, in saying as Mudgel said....?...((New plugs in older versions may not work right either?)).....Hmmm....cheers .