Objects are floating
Sometimes after a sim update or significant scenery change the simulator needs its cache emptied in order to stop anomalies in rendering.
1. Navigate to the in-game settings window, and find the rolling cache setting.
2. Clear any existing rolling cache you may already have
3. Delete the Content.xml file.
Marketplace: "%localAppData%\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache/content.xml"
Steam: "%appData%\Microsoft Flight Simulator/content.xml"
4. Delete the simulator .dat files (AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\SceneryIndexes\*.dat)