By now we understand what causes the issue (it needs COCKPIT_HIGH_LOD=1 and MAX_VC_TEXTURE_RESOLUTION=4096 in the CFG) and that should be the standard setting after install. What we do NOT understand why this is not the default setting for all users.   it is now clear that the sim itself set's this automatically when the sim crashes due to a lack of VRAM. Very nasty behavior and we have discussed this with Lockheed.