I’m using FSLTL and it regularly places bright pink planes in my sim. I downloaded the addon via Flybywire and just fun it from there.
Why is it doing this?
Usually a conflict with another addon. Have disabled all your other addons to test ?
the only other addons I have are PC-12. rex trees, and one airport.
Ok, if you could disable them and test again, that the best way to identify the root cause.