Steps to produce:
1. Have two users open the video editor for the same event.
2. Have one user apply edits/workflow to the event.
3. The other user can still apply their own edits/workflow to the event. Allow them to submit their edits/workflow.
Of the two workflows, one will fail whereas the other succeeds. However, due to the failed workflow, the event will not be published (assuming that the publish step is incorporated into the workflow(s) in question).
If an event is subject to an active transaction, the Save button in the video editor should be disabled.