Often (but not always!) LDPE doesn't show a part X referenced in file Y when you open Y in 3D editor, even though part X is in the same folder as Y. Both LDView and MLCad properly show part X when viewing file Y.
Sometimes it does work, but I haven't been able to understand the difference between working and not working situations.
Sometimes it does work, but I haven't been able to understand the difference between working and not working situations.