Overlay Preview Not Showing
This issue might be caused by faulty install of Racelabs, or if you have pressed "ctrl+alt+H" on the keyboard. The easiest way to fix, is to do the following:
  1. First with racelabs open press CTRL + SHIFT + H a few times to be sure "Hide overlays" has not been activated.
  2. If still not working - Close Racelab  app.
  3. Open the following folder C:\USERS\YOURNAME\APPDATA\ROAMING\RACELABAPPS   
  4. Then find this file name and delete it. user-preferences_v5.json.
  5. Next restart your computer. To test, open Racelabs after the restart and select correct sim game name on left of Racelabs, and add an overlay. 
  6. Now join a sim session. The overlay should work normally and also be displayed in the Racelab preview window.