I'm stumped by this one.
About a week ago, when I'm working on my Donner Redo, trees and other assets will start sinking when I place them. I have to right click which will stop the sinking and then click on the asset and then hit the delete button on my keyboard to get rid of the asset.
Once this process starts, it does it on every asset I try to place afterword.
I have to give up and exit.
It doesn't start this way, it seems to start about 30min or more into a session of editing the scenery.
It's gotten really bad west of Tunnel 1, west of Blue Canyon.