Brad ... I tried OPUS, loved it, but went back to REX because of what you are running into. I didn't realize it at the time, but it caused another problem ... crashing after 5 miles of flying. I've had to "reload from scratch" again last night and this afternoon. I'm putting in all the RTMM scenery locations AGAIN , whew, what a boring job that is.
I ran into a problem with the G3D.dll crashing, after about 5 miles of flying ... over and over, again first with OPUS, then again after a MYTraffic install. Seems almost any 3rd party can do this. There's an easy fix ... you delete the shader folder when you are NOT RUNNING P3d and it rebuilds and the problem is gone. So I've run into that one now twice ... and didn't know there was an easy fix ... I've reloaded from scratch twice (getting pretty good at it).
So I'm adding all our wonderful locations to the scenery library, then I can get back to the QC process. I haven't got IS3 in P3D yet ... going to make sure it is all settled down. Doing the IS3 work with FSX.
REX is working well for me by the way.
Doug