Started to use to co-editing with the team, and it was something we've all been looking forward to. My collegue was presenting live in a meeting and I could edit in real time, add stuff " is this good " etc. it truly worked like a charm, but just yesterday the " accept changes" confirmation feature came which we had not seen so far, and it really killed everything we just learned to love, not being able to work on the same file at the same time <- really aint co-editing all about this ? , not being able to do live fixes and suggestions while streaming to the group. Is this something you can turn off ? A sign saying " accept changes" without even seeing whats changed really just took off all that was so great to use :))!!
Sorry to hear about the trouble. This message generally appears when the document was not synched and because of synch issues, co-editing gets disabled. I'd request if you can ensure that the co-editing of that document is enabled and then check again.