Okay, the rocks are fine. Are the trees Bryce trees that are grouped with the rocks? If so, grouped Bryce Trees crash Bryce 5.01 and 5.5 when attempting to import or export them from the Objects Library or on trying to select/create them from the library. The OBP can be placed in the Objects folder to access, It can be selected in 5.01, but crashes on clicking on the checkmark and in 5.5, crashes if you even select the object. If you create an object with grouped Bryce Trees, it can be saved to the library, but they can't be used. Hence the problem DAZ had with the Content Kit and Foleypro's trees. If you provide the object as a Bryce scene, then folks can use it.