I just updated to InDesgin CC 17.0. I have a MacBook Pro 2020, with OS 10.15.7. Trying to open an InDesign CS 6 file with modified links to other InDesign documents causes the application to hang up and I have to force quit it. It doesn’t matter if I choose update links or don’t update links in the dialog box. In trying to quit and reopen I did manage to recover the document, but I still cannot resolve the modified links problem, since the application hangs up every time I try to update the links in the links pallet. Same with trying to just replace the link. I do have font errors mentioned for these links in the preflight panel that did not occur when working with this document in the previous version of InDesign.