black rectangular artifacts on af file re-open or svg file initial open

[spinhead]

Just opened the attached file I created yesterday and it shows the black artifacts as in the screenshot JPG. The Navigator shows no problems and the exported JPG is fine.

This is the first time it's happened with an AF file. To date this has only happened with SVGs I created as text so I thought it was something I was doing. Happens pretty consistently with my SVGs.

Designer 1.8.4 on recently rebooted Mac Catalina 10.15.6

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[MEB]

Hi spinhead,
I'm having trouble reproducing this here. What your system specs (integrated and dedicated graphics)?

If you go to Affinity Designer Preferences, Performance section turn off Metal compute acceleration and restart the system. Does it still display the same artifacts? Also try to change to OpenGL and check again. Thanks.
 

[spinhead]

Here are the specs; will try making those changes and test.

Chipset Model:    Intel HD Graphics 5000
Type:    GPU
Bus:    Built-In
VRAM (Dynamic, Max):    1536 MB
Vendor:    Intel
Device ID:    0x0a26
Revision ID:    0x0009
Metal:    Supported, feature set macOS GPUFamily1 v4

[spinhead]

No beneficial effect with the changed settings, but it does become  u g l y - d o g - s l o w so I've switched it back.

Resizing the image with a quick CMD- CMD+ removes it, so that's what I'll do for now. Happy to do more troubleshooting if we might learn something.