Hello.

Our company uses this software (DraftSight 2019 x64).
My colleague haven't used it for weeks.
When he launched it yesterday, he was seeing double mouse, baselines, and drawings.

I can't draw a straight line.
To be precise, he drew straight, but his line does not look straight.

I connected the computer to another monitor, and the same happens to that monitor.

I have attached an image.

This abnormal phenomenon occurs only on the left main drawing screen.
For example, the menu area is normal. Also, other software is fine.

His computer is Windows 10 Pro 64bit 1903.
I uninstalled DraftSight and installed it again, but there was no change in the displayed results.

Please give us any useful advice other than replacing your computer.

I am an inexperienced IT department employee and have no experience working with CAD and DraftSight. We do not have advanced IT technology.

And my English skill is not good, so this English sentence was created by automatic translation. Please advise in English as simple as possible.