Hello, has you saw on the title, my GPU disappeared from my Vegas as I restarted it

When I installed Vegas 15 and launched it for the first time, it was here
But when I restarted Vegas, it disappeared

Same when I installed the (build 261), it was here at first, and then it disappeared

I've got an Nvidia GTX 960, and I'm on Windows 10

What can I do ?

Thanks. 😃