Harm Swinkels

For me, i have not really noticed traffic actually disappearing yet. Though lately i noticed that the aircraft lights of VATSIM traffic often extinguish when in close proximity, say within a few miles, which at night pretty much renders them invisible (quite annoying when lining up and someone is on short final but failed to mention so on Unicom :P). Is this also a known issue? I've heard from others that they noticed it as well. Cheers, Harm