last night i install some other scenry and airplane,after finish I run fsx,but I found bgllman.dll err in an open windows, then I reinstall the zurich, I found kjfk gone, then I reinstall lssg,but the err messeage come back,I search the forum,I remove the bgllman.dll and bglmanx.dat,bglmanx_fsdt.dat,after that I uninstall lssg,I am afraid waste the active time, after complete I check the dll.xml,it look seem no problem, and the error messeage gone,I think the problem has gone,but when I load to zurich ,I found no bulidng in the ground.KJFK the same wrong. How to sovle the problem. and I wrong about to reinstall all of them and waste the active times.