A few players reported this issue on our server, it was cleared when we restarted the server and they relogged. Apparently it is an issue with trees planded right before the patch. Perhaps "grow" would fix that as it forces them to advance to the next graphical stage.
All human growd tree are now invisibles. If you plant a new tree near the invisibles all aroud apear. But only for people in range. Wen you relog all tree are invisibles again.