Uh oh, getting a new and fun bug. Tried to get Parallax to work for the looks, removed it because trying to load in would cause a black screen (and delete 5 of my vessels). Removing Parallax still resulted the black screen upon opening the save, permanent loading state. I updated to the newest Kopernicus release, tried lots of things, verifying files, but now I get this error in the log.
[LOG 21:29:10]: [Kopernicus]: Configuration.Loader: Failed to load Body: Squad/Kerbin: Default constructor not found for type UnityEngine.Material
Would post the entire log but I can't attach the .txt file. This seems like the main issue here.