That's what I've run in to but, again, since I use external runtimes, too, I just load them before loading the scene and then P7 doesn't have any problems finding anything.  Once the scene loads I save it and then offload the runtimes I'm not going to need.  After that, P7 knows where everything is and I don't have to bring in the runtimes I'm not going to need to modify the scene.

Give it a shot.  It's an easy workaround and always works for me.

Hugz from Phoenix, USA

Victoria

Remember, sometimes the dragon wins. Correction: MOST times.