Hello,
Since the last update or so, when we launch a Render window, you are unable to interact with the application until the render is complete. This is both for our plugin, and also for the Rhino renderer. With the latter it even sometimes crashes at the end of the render. It behaves just as if there was an invisible window in front, blocking all application input.
It would be great to have a fix soon, as we are currently working in this area.