The tree lab is broken too. When I (and others) try to edit the tree to any degree, the program crashes. I cannot load the full cathedral scene from the content bundle either. Bryce 5.5 crashes after about 4 minutes of wait time. This scene loads quickly in Bryce 5.01. I am not using a state of the art system but it is more than the system requirements state. Hope they fix this soon, until then buyer beware.