May I know which version of Photoshop are you using and on which operating system?
The latest version Photoshop is Photoshop CC 2017.1.0
You can try updating Photoshop.
Photoshop CC 2017.1.0 has been installed in both computers. Therefore we are using the latest version.
System Type: 64-bit Operating System. Windows 7 Professional, on both computers.
I have just updated Photoshop to Version: 2017.1.1
and I am still having the same problem.
May I know which graphics card is installed on your system?
Both computers have AMD Radeon HD 5450.
I have updated the drivers and restart the computer, as you recommented but nothing changed.
I believe it is a settings issue. I did a little google search again and found a post that solved my problem. I am not sure that this is the corret sollution as the colour that has appeared around and among the artboarts are lighter than the rest of the background (see photo attached)
What I did:
Glad you found the solution to this issue. Feel free to reach out to us for any future queries.