I'm also getting this freezing when switching between Flight and Map view using Outer Planets Mod / Kopernicus. I primarily use Astronomer's Visual Pack/EVE, plus Distant Object Enhancement & PlanetShine as my main graphic mods along with OPM/Kopernicus. This is on a regular sized solar system running KSP 1.7.3. I've been doing some testing swapping out of these different graphics mods and it seems OPM/Kopernicus is where it's occurring: Any help to resolve would be super-fan