The problem may be a display problem from the use of transparent parts/textures to give the effect of a screen mesh. Try creating your own fence as a .bgl Using Abacus Airport and Scenery creator or Gmax. Failing that try, adding the fence macro with FSSC as a .bgl produced, after everything inside the enclosure has been produced as another .bgl . Got objects outside the enclosure? Produce them as a third .bgl. This may help solve some of the transparency dropout.

Well I had simular problems with a scenery I am about to release for Pendercrafts.com  If the above does not fix problem I may have another fix that will work I have been having the same problem with solid stuctures dropping in and out of display. But I think that was a high poly count prob. You might want to check out my posting "scenery display problem in FS9" I never got an answer but I found a work around that fixed most of the scenery items that were giving me probs. I hope one or the other of my suggstions help.

Glitch