The image loading feature tends to result in blown-out images.

[Narazaka]

I understand this is more of a bonus feature, but for some reason it often ends up overexposed, which makes me wonder why.
This happens every time, and I usually have LTCGI or VRCLightVolumes installed—could that be the cause?

[Narazaka]

Actually, it might not be limited to just images.

[JLChnToZ]

What is the default settings for your screen and setup? Let me see if I can recreate the environment

[Narazaka]

This is with VizVid in its default state (just placing the prefab into the scene as-is).
I have Bakery, VRCLightVolumes, and LTCGI set up.

[JLChnToZ]

Will it caused by the bloom too high in your world?

If so I suggests you can adjust the emission intensity in the screen material.

[Narazaka]

This issue occurs even though I’m not using any post-processing at all, let alone bloom.

[JLChnToZ]

Can I confirm you are using the "Video Surface" or "Video Unlit" shader for your screen?

If you are using the "Video Surface", it will get affected by lightmap / light probe.

[Narazaka]

That might have been exactly the information I was looking for. Since it’s the default setup, I’m using VideoSurface. So it is affected by the lightmap.
I see there’s an option called VideoUnlit. There were various materials like VideoCRT and others, so I didn’t realize that I should switch the material.

[JLChnToZ]

VideoUnlit and VidoeSurface are for displaying on a quad/other meshes.
VideoCRT is for rendering on a custom render texture.

So I would suggests you to try VideoUnlit if you don't want the screen overexposed by the environment.

[Narazaka]

Since this tends to happen when lighting is set up in a straightforward way, I think it would be helpful if it were mentioned in the manual.