Getting an error code when trying to save

It’s late here now, but @trent will have seen that you posted a new reply.

Can you share the file? Otherwise it will be difficult to give you a solution just by guessing.

Well that’s the essence of the problem. Once you get this error you cannot save…

We just rebuilt the drawing rather than waste more time on it. We found a weird artefact as we deleted everything 1 by 1. It had no properties, it wasn’t a link, and it could not be deleted. We don’t know where it came from.

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This is still a problem 9 months later!

It is fine that a reference get corrupted and the file has issues… dead links is a common problem with complex files that reference exterior resources.

…BUT it breaking the file completely and there being no way to pinpoint the errant reference really sucks!