Normal - Launch session toolbar scaling issue

The UEFN editor seems to be getting confused when I use windows display scaling.
On a 4k monitor with 125% scaling I often have the launch session toolbar do this and nothing happens when you click it -

If I go into display properties and move the screen layout or change the scaling from 125% to something else then back again, I end up with this strange menu with duplicate options. The play button in this case launches the session -