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So apparently this started happening by random on different monsters/items, where they show up as having a black outline around them.
But when I enable High Quality Resize Mode, it disappears. I can turn that back off and it stays corrected too, until the map changes.

Note, I have no idea when this started happening, but I think it began around that time?

Do you have anything more reproducable? Or at least some hint on what combination of graphics formats and options makes it likely to happen?

Which mod?

After spending the past couple of days trying to figure this out... My efforts have failed to replicate it in a simple manner. All I had to do was delete one set of FONTDEFS and suddenly it started working again (I'm playing with two mods) yet the bug never appeared in any simpler examples I tried to make...

The mods involved are D4D and Clusterplex (not yet released). I'll keep trying though. If after a time I have no success, I'll send you both all the files involved.

What did that FONTDEFS lump do?

Just this. And even when I put it in its own little test package and included the graphics appropriately, the bug still couldn't be reproduced with it on.

When something like this happens, it usually means the cause is not obvious and it might be a special combination of things required to produce the undesired result.

What you could try to do is make a copy of the package causing the bug, and eliminate resources one-by-one until the problem goes away, and see if you can figure it out from there. I understand that may be a lot of time and work, depending on the size of the package, but if you do have the time for it, it's well worth the trouble.

That's actually exactly what I went through already. That's how I discovered it. I started deleting things one at a time and found out it was FONTDEFS. I restored everything else and kept out the fontdefs and it still worked.

That's not how to conduct such a thing. If the absence of that single lump makes a difference you should put it back in and remove other things until you have a minimal test case that reproduces the issue. Right now we are stuck without any idea what to do.

Well I don't know what else changed again, since I haven't updated anything else but now it's working again. Even with the fontdefs included.

I don't know anymore. Maybe it was just a glitch. I doubt it's happened to anyone else but it's no longer happening to me. Should I get it to resurface I'll post about it here.

Ok, putting this on hold then.

OK I suspect my bug here might be a duplicate of this. So I think that one can be closed.

Edit: Found a potential culprit, if I disable "Precache GL Textures" this bug stops triggering.

I've been seeing reports of this bug on a few Discord servers I'm in. This appears to be far more common than previously thought, and really needs to be investigated ASAP.

This needs a simple contained example to be investigated. There is none here.
And that screenshot by itself is useless

(Forgot to reply to this)

Graf Zahl wrote:This needs a simple contained example to be investigated. There is none here.

A sample cannot be made if no one knows what triggers it.

And that screenshot by itself is useless

The point of the screenshot was to illustrate that more people were having this issue.

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It seems that translations might be a possible way to trigger this. The attached sample was posted to the Discord by the user RaveYard. I can reproduce the bug reliably on my end.
Make sure to disable GL texture precaching. If it doesn't trigger immediately, you can try changing the texture upscaling options to see if you can reproduce it.

Hopefully this is the same bug and not a different one.