Hello,
I have the same problem as Jimalo has. Not sure why though. All the buttons appear to be working when clicked upon, they are just not visible.
I have downloaded the latest GPU drivers as that was my first idea but this did not help.
Also once I changed the PC screen resolution and the icons appeared but was unable to replicate this

I am attaching the screenshot of the Mach3 screen.
Any help is appreciated.
Thank you.
BR,
Hydrant