started having this issue when we upgraded to 5.2… you can collapse a folder in the outliner and it floods the logs… it’s really annoying because you don’t know if something is really wrong
EDIT: the solution provided by bengmusic worked for me, open the project, close it, remove the whole AppData/Local/UnrealEngine folder and its contents, then open the project again.
Another thing to mention, I always launch my projects from Rider/VS using the run debug button