I ask because QTX can't play .qtz files and there is a beautiful screensaver I've been in love with since Tiger called Snowfall. You can download it here: http://www.alittlebitofnothingleft.net/snowfall/ Under Tiger and Leopard, the screensaver was amazing, but in Snow Leopard the screensaver is jittery. I'm assuming this has something to do with it being a Quartz file? Does anyone know if the qtz file can be recompiled to work fluidly again? I've contacted the dev, but have heard nothing back.