Make Single User greyed out after scene is reopened

[DNorman]

I do not use the linking function, but I have read that overrides do have many known problems.

There is a long thread here for override problems, I think this is related, you could try asking in that thread.

Links & Library Overrides are still glitchy after 4 years of development

Does anyone use these in their work? Have you used them a long time? If so, do you think they work reliably? We have begun to try them where I work, but… Also, of course the usual UX issues which aren’t allowed to be seen a bugs… The only way to link a hierarchy into your file is to link the collection its in. However, there’s no easy way to then override the hierarchy and make changes to it, since you can’t just make the collection local. You have to move the enti…

Edit; just seen your last post! I thought you meant the world lighting or light nodes.

Have you tried making a new copy of the material with a new name instead of “single user”?