I get external error for anything placed inside any of my maps. Thing is, this is a fresh 4.10.1 project, not upgraded. The only thing I can think of is it’s a source controlled project. In my main test map, the meshes/materials were migrated from a previous (older) project and the other map is being worked on and updated by someone else on the project. I have not yet tried the renaming of my folders yet to see if this solves the issue; this, I think, will prove a challenging task with the source control but I will give it a shot.
With these errors coming on a new, non-upgraded project, proves that this is not a result of not following Epic’s recommended upgrade procedures. There is something else going on and it should be looked at deeper. I have not tried to build my project yet with all these warnings but I have a bad feeling. I will be trying a build/package this weekend just to test.