Photoshop issue following update to v 24.3

@HoneyBlossomUK - further to Jane's advice, in case you or anyone else would like to know a little more about what's going on here, please read on:

Here are some suggestions from Adobe for GPU issues.

First check the system requirements: https://helpx.adobe.com/photoshop/system-requirements.html

next:

https://helpx.adobe.com/photoshop/kb/troubleshoot-gpu-graphics-card.html

https://helpx.adobe.com/photoshop/kb/photoshop-cc-gpu-card-faq.html

Also:

Does turning on »Deactivate Native Canvas« (Photoshop > Preferences > Technology Previews)

and restarting Photoshop have any bearing on the issue?

And sometimes this helps:

Go to Preferences > Performance..., uncheck Multithreaded Compositing, and restart Photoshop.

Also try this:

Check your hardware acceleration settings and in particular turn off the Native Canvas.

Do that in Preferences>Technology Previews:

check the tickbox for 'Deactivate Native Canvas' and uncheck 'Enable Native Canvas ', then restart Photoshop

Next step would be to go to Preferences > Technology Previews... and enable "Older GPU mode (pre 2016)", then restart Photoshop

Next step would be to disable the GPU in Photoshop preferences, then restart Photoshop

Also consider updating your graphics driver

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management