That's very weird, what exactly happens when you try to open the screen saver (error messages, etc)? What are your system specs (exact system version, architecture, etc)? I've been able to run the screen saver without isue on Mac OS X Leopard, and Tiger both Intel and PPC here (panther untested) but obviously it has not been tested on every possible configuration that exists out there so problems likely do exist. Please work with me on this issue so that this bug can be squashed, thanks for the feedback!