Good news! This one worked on the latest driver! They latest driver is from 12/5/2020 . As you can see they have been fixing issues.

it was Driver Version: 27.20.100.9030

I hope that helps... That is the most I can do to test here

Thanks
Brian

Thank you Mr. Barker.

I have the following:
Intel(R) UHD Graphics 620
Driver Date: 6/6/2020
Version: 27.20.100.8337
Digital Signer: Microsoft Windows Hardware Compatibility Publisher

Update and tell me if it works !

I think they fixed it! Woot Woot!

Mr. Barker- YOU ARE THE MAN! Updated driver to .9030 and it worked. Thank you for all your help!

I only signed up yesterday, as this was one of the (many) Mach4 problems I have to solve. My tool path window looked exactly like the OP’s, and I suspected a video driver problem, although I have no idea why it would affect just that particular element of Mach4 and nothing else. And it was a particular worry, as I’ve just bought the computer, a tiny little Intel NUC10i5FNK with on-board graphics.
My existing driver was ver. 27.20.100.8280, and I updated it to ver. 27.20.100.8681 on the basis of the advice here from Brian Barker. I’m pleased to say it worked like a charm. Thanks.