KDS screen is blank

Check the connection pill

Top-right of the KDS surface. If it's red (disconnected), the realtime transport is down. Check the status page at /status.

Check the location filter

The KDS only shows tickets for the location it's signed into. If a manager moved the terminal between locations, re-sign-in at that location so the filter matches.

Check the age-band filter

The KDS hides tickets older than 30 minutes by default. If someone left the filter at *active only* they won't see a freshly bumped ticket that was then recalled.