VRAY Frame Buffer Disappeared

Hi all,
Since i came back frome holiday my VFB window has diappeared, everything is OK when I launch a render but the window is invisible.
Altough i can see the preview of it in the window 10 taskbar.

Does anyone has a solution to help me ?
I have an emmergency at work…

Thanks in advance

I have found the solution in an old post

See below

It works fine, thanks to the Chaos Group support !