I cannot release: changes are pending
Upload & release (and downloading again) is refused while there are unsent changes. Follow these steps:
- Make sure the computer is online (footer).
- Use Sync › Force sync now.
- Open Sync Pending Items and click Retry failures.
- Resolve conflicts with Keep local or Accept cloud.
- When the status shows Sync: up to date, try Upload & release again.

Do not use Unlock in the web admin to get around pending changes: anything not sent would stay only on this computer. See also Check that everything was sent.