So I booted up the SIM, without changing anything and got the Terrain Spikes… Disabled “Bijan Islands and Boats” using Addons Linker, and all Terrain Spikes gone… Re-enabled “Bijan Islands and Boats” and the Terrain Spikes returned… Yet to do a flight, although I took the Drone cam and explored quite a bit, to simulate the path my aircraft took… Removing “Bijan Islands and Boats” solved the issue for me… Hope that helps, let me know if you want me to do further tests…