InCopy Assignments not updating

I work for a publisher and our copy editors inserted changes though out a 400+ page book and when I open the InDesign file and update the Assignments, nothing happens, I cant see any of the changes or any of the notes (when I opened the InDesign file I never got any indication that the assignments had ever been updated). Even when I open the ICMA files in Incopy on my Mac, I cant see any of the changes or any of the notes. We’re working off a server and no one has moved the files off and back on so we don’t think this is a permission issue. I’m working on a Mac while the copy editors are working on PCs, and we’re also all working in CC2015. Any ideas on how to get the Assignments to update would be greatly appreciated.