It is taking so long, I am forgetting why I cancelled! Now, I am old, but not that old. This happens every so often when there is a V-Ray update, and the last update is causing it again.
Two minutes to stop the render and 2:30 to close the VFB - 4 1/2 minutes every time I need to stop a rendering is silly, a waste of time.
I remember that this also happened to me, cleaned the file and merge into a new one solved, but cant say if this will help in latests releases, havent happened in a while