i know that this post is quite old but i believe that some ppl still look for answers.If really matters where you actually standing at the time when you open prop menu than i think that those objects are all (or most of them) valid but becouse you are not at the area of interest that is why they come up invalid.At least this is the way i understand it and i have gave it a try and it looks like that maybe the case.The only thing that slows me down is when you go trough the list and all obejcts are invalid so it takes forever while you get to the one you looking for.However thanks and appreciate your help.