I am also getting CTDs. I fly VR, but use non-volumetric clouds. Typically now, Xplane loads much more slowly and when I am finally in the cockpit, I get maybe 20 seconds before a CTD if I don't touch anything. The CTDs are always related to an activity of Traffic Global. If I disable Traffic Global, no more CTDs. Up to 5.0.4 I had no problems with SMP and TG. Since loading 5.0.5, my FPS is much lower and I have to turn off TG to be able to fly.
I reported this to Traffic Global as well.
EDIT: PROBLEM SOLVED. It was Avitab that I updated at the same time as Skymaxx. Folko provided a new file and cured the problem entirely.
Thanks.....