On Mac OSX, I've had some applications that I need to force quit and then relaunch -- no problem. This is the ONLY application I've ever used on Mac OSX that crashes my Mac! Keep Diskwarrior by your side if you choose to try this. Mac OSX 10.4.8 on a PowerPC Dual 2.5 GHz and 4 GB SDRAM. Unfortunate. I just purchased a Blackberry Pearl. I really like the Blackberry but back to Cingular it goes without the ability to synch reliably. Sorry RIM... time to wake up. The Mac is back and here to stay!