The presence of that icon in the Windows system tray means Flight Reader is currently running. You should be able to display the main Flight Reader window by left clicking that icon. Or right click it and choose “Open Flight Reader”.
If the main Flight Reader is not visible at that point, then it’s possible you’ve encountered some type of unhandled edge case causing Flight Reader to become unresponsive. You can manually shut down Flight Reader from the Windows Task Manager by right clicking “Flight Reader” in the Processes list and choosing “End task”. And then start Flight Reader again.
This could occur for several reasons. First, check that you don’t have any failed flight logs waiting to be reprocessed here:
If that failed button is hidden, that means no flight logs have failed to process.
Next, ensure you’re not filtering out any flight logs in the main Flight Reader window. Use the filters at the top left to show all available flight logs like this:
Next, ensure the flight logs you’re missing have been uploaded to the DJI Cloud in DJI Fly or any other DJI applications you’re using. You need to configure that syncing (like this) on all devices you’re using to fly your drones.
Keep in mind that manually syncing your flight logs in Flight Reader will only attempt to download new flight logs uploaded to the DJI Cloud since the last time Flight Reader synced your flight logs.
Finally, if you’ve done all of the above and are still missing flight logs, then try downloading all of your flight logs from the DJI Cloud again. To do so, edit your existing DJI account in the “Sync Flight Logs” section of the Flight Reader Options window, choose to sync “All available flight logs”, and click “Save Account” to kick off that re-syncing process.