InDesign and InCopy Compatibility

I have InDesign and InCopy CS6 Version 8.0 on one computer and InCopy CC Version 9.0 on other computers. I'm having a lot of difficulty working on individual documents in InCopy. On one of the InCopy CC Version 9.0 Computers, the software isn't correctly identifying when the document in the assignment is copyfit. On another InCopy CC Version 9.0 Computer, the changes made aren't saving and then can't be seen on other computers with InDesign and InCopy CS6 Version 8.0. Is this because of the differences in the software? Is there a way that I can fix this?