InCopy Assignments - "The Content is locked and cannot be modified."

I've been using Incopy for a magazine we publish every month and since the updates to CC and CC (2014) we seem to have error messages popping up "The content is locked and cannot be modified."

This happens on both sides, for the editor in incopy and for me when I updated content back in InDesign. We both work on Mac OS - remote workflow (packaged assignments), ID 10.1.0.71, IC 10.0.0.70.

Could it be the difference in version numbers? The editor checked and there was no other updates for incopy CC 2014.

While clicking 'ok' on the error message seems to accept edits after all it is a real nuisance, and very confusing/disconcerting.

Any help much appreciated.