Manual Staff Visability dialog opening problem

Thanks, Keir. I guess you are experiencing the same problem as the user in this thread:

As yet we’ve been unable to get to the bottom of the problem. The first thing to try is to update your graphics card drivers. We think the issue is connected to OpenGL/Angle and a potential incompatibility with the drivers on that system. I actually have some more troubleshooting steps from a colleague in our development team to share, so please check that thread for more things to try.