I also found that in my project. I have check the XML code so many times and it is correct. The static model shows up. One of the jetway will disappear after that parking was seleted. If there are two, the “MultiIndex=1″ jetway diappears. The” MultiIndex=2″ jetway is still there and working. If there are only one jetway, the “MultiIndex=1” jetway diappears. Even though both jetways use the same MDL file. I thought it might be something to do with drawcall batching in MCX. I went back and load up MDL file then disable drawcall batching and compile the new MDL. The problem is still the same.