Sun Soft Shadows work for me except that the status of the switch doesn't save except with skies created from the default. Big bummer for batch rendering! Adding too many trees (say 12+) results in a corrupted Save file. The union of Volumetric objects produces artifacts. Volumetrics crash Bryce when used on Metaballs. As Stephen mentioned Bryce windows often lose focus but for me it happens in the Terrain editor. Bryce will continue to render after going to a mode-less dialog resulting in very unpredictable behavior in the dialog. Mac G3/OS9.2/500MHz/659MB for Bryce (5.01)