Thank you for your patience all this while, We have concluded our investigation into the issue and below is our finding.
This issue is due to the use of a specific version of Extensis Universal Type client: version 6.1.6.
The issue is reproducible only with Id 2018 as Extensis UTC 6.1.6 is not compatible with Id 2019.
If you are using Extensis UTC 6.1.6 with InDesign 2018 please use any other version of Extensis UTC which is compatible with Id 2018 to avoid this issue.
Or you can upgrade to Id 2019 and used compatible version of Extensis UTC.
InDesign TeamVince Yim commented
I got this too. Closing the InDesign file and reopening it generally takes care of the problem, but it can randomly show up as modified while I'm working on the file, even when the file time stamp is exactly the same as it was before. Also, once the files show up as modified, saving the document makes it so closing and reopening the document makes the modified label permanent until I update all the links. FYI, I'm working off a shared network drive.Vince Yim supported this idea ·