I am having the same issue in V4. I have ORBX VECTOR (with AEC disabled) and GLOBAL installed. I do not have SoCal.
I'm sorry, but I'm not very familiar with their software but, I heard several reports that, their AEC program, which is supposed to fix elevation problem caused by OrbX to other airports, didn't recognize the native P3D V4 installation method we use, so it doesn't see the scenery, so you must enabled whatever fix that AEC is supposed to provide manually.
Sorry not to be more specific, but the issue is entirely related to OrbX so, you better ask them, because I'm not even sure if they have fixed or not their AEC to work with proper P3D V4 installation (scenery not installed in the scenery.cfg), like our own.