What version of InDesign? Have you tried opening as a copy?
We are up to date on. both machines, with ID 2017.1 Release, 184.108.40.206 Build.
I have just managed to open it -- not sure which of my remedies solved the problem.
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For what it’s worth, I hope you’re sharing those files in a Dropbox folder. That way you can always roll back a version.
Actually, we are Networked -- so have been using the same file which resides on one of the two hard drives. I did consolidate all the assets in CC asset folder, and followed instructions to delete ID preferences. Also renamed one of the Hard Drives, since both were still on the default "Macintosh HD" title. One of those did the trick
Thanks again for your help!