Hi, I had (have) the same prolem with the 2.5 D trees I use. I have noticed that if for instance the window and the tree are NOT in a group there is no problem. But if the window is in a separate group (what I usually do for easy editing) it 'shines' thru the 'alpha channeld' tree. (png texture). Hope it is of some use. erikB

For posterity, the proper path is Macintosh HD/Library/Application Support/Google Sketchup 6/SketchUp/Plugins Todd