Weird seams with subdivision modifier

Support Modeling
1

Came back to Blender (v 3.1.2) after a long pause.

Never recall these artifacts happening in older Blender versions. In edit mode those edges are not creased or anything.

Any ideas what’s going on?

I did notice the Mirror modifier glitching crazy, but I hope this issue is unrelated and can be fixed.

Thanks

2

Try “Clear Custom Split Normals Data”- it’s in the properties somewhere, you can F3 and search it I think

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3

Also after editing or applying modifiers, you may have to set smooth shade again (object mode - right click - smooth shade). I have had that problem where after changes, parts of the mesh “forget” there is smooth shade and I have to reset it.

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