UPDATE:

I notice that the bug also affects the “Update Design” feature in InCopy.

1. Designer changes layout in InDesign (change in design)
2. Designer saves file but keeps file open.
3. Assignments panel prompts Editor to update the design (Out of Date)
4. Editor clicks on “Update Design”
5. InCopy closes the file and I GET ERROR

In this case the bug is more troublesome because in order to get it to work on both computers (Editor and Designer), the Editor needs to ask the Designer to close the file and for him to open it first (so the same way I described earlier)