Oooohhh, you just popped a memory bubble in my head.
I actually, had this same issue with Vegas Pro 12 or 13. I’m struggling to recall what the resolution was…I *think* it had something to do with QuickTime needing an update for BorisFX previews to show in Vegas Pro, I *think*.
(I don’t why that emoji got so big)
But, I did have this issue as well; the only thing I can recall it was software related. OORRR Maybe you just need to refresh the BorisFX license.
Man, I wish I could recall how I fixed it. Wait for BorisFX, they’ll set you right.