That is a bummer.
I just got UTX 2.0 for Europe and the U.S. (after using Orbx global and vector (and Europe LC). I LOVE the UTX product. Sad to not fly my home country the way it should be...
This happens to me too, using latest nVidia driver and not nVidia inspector. I also have a 780 (two actually).
Edit: this never happened prior to v2.5. I do notice that it seems to happen mostly after returning from a menu (adjusting a setting or something) and then goes away.
Also, my GPU temps are low (60's) so it's not an artifacting-thing from overheating.