Checking the selection was the first thing I did :).The only thing I can think about is that it has something to do with the saving directory .Because when the new module starts is a temp file .Then I save it as a .mod and trees dont show anymore.I dont know ...maybe I talk nonsense :D hahaha .
You might want to check the tab in the called "selection". And see if trees are checked, I usually have trees unchecked so I can select things that are placed near to under them. Also, if the trees you're not seeing are custom, maybe you need the override files for them to show up. Hak files are for players and override versions are for builders. ;)
