Like a few others I am also having an issue with the buildings not loading. The map decal loads fine, but none of launchpads or other statics do. I can open the KK editor (Ctrl-K) in game and add the statics that way. They work during my play session, but do not persist after restarting KSP.
I've downloaded the current state of the master branch on GitHub and I'm using KSRSS from the GameData branch on GitLab. I have all the dependencies installed and up to date too.
I've tried placing the Modern and Retro folders in the Instances folder, deleting the NewInstances folder as well as the other fixes suggested in this thread.
Been trying to figure out what might be going on but I am out of ideas. Does anyone know what the issue might be and how to fix it? Looks like it might be with KK itself?