Made an account just to help with this issue. like Benjamin Said it has to do with ADD ON scenery interfering with ORBX autogen. I disabled scenery by developer at a time, for example i first disabled all of my fly tampa addons then restarted sim and see if that solved the issue. the i did the same with imagine sim, latin vfr...etc for me what was causing my trees not to fully show was the flytampa sceneries. anyways i disabled that scenery autogen in the addon.xml and problem solved