The track of the mouse is painting the screen

[bungalow]

Otherwise successful Mojave build (see spec in my sig below).

I'm using the onboard Intel graphics of the ASRock Z370 and a cheapo USB mouse.

On some webpages and some other instances, where the mouse has tracked changes colour in squares about the same size as the mouse pointer.

Scrolling the page up and down refreshes the screen and removes the artefact.

I've never seen this before. It looks like a graphics refresh issue.

It's not a huge issue, but slightly annoying.

Any ideas please?

 

[bungalow]

I should have added:

I am using the DisplayPort but with an adapter for my Samsung monitor that has only a DVI input.

Would that be a factor?

Otherwise successful Mojave build (see spec in my sig below).

I'm using the onboard Intel graphics of the ASRock Z370 and a cheapo USB mouse.

On some webpages and some other instances, where the mouse has tracked changes colour in squares about the same size as the mouse pointer.

Scrolling the page up and down refreshes the screen and removes the artefact.

I've never seen this before. It looks like a graphics refresh issue.

It's not a huge issue, but slightly annoying.

Any ideas please?