[Bug] Meshes disappearing after re-opening project file

Everytime I load then save a project file, whether it be a template or not, once I try to reload the project or open it again, all meshes (including actors) will either be pure black or simply not exist anymore. I have not been able to start any projects because of this glitch. This primarily happens once I do the following for creating a first-person camera on an actor:

Thirdpersoncamera blueprints > viewport > set camera to head socket, pawn control camera movement, camera control yaw > compile, save > save ThirdPersonTemplate > exit > open project > broken

Tried posting in Help forums, keeps stating that the site is unavailable.