I've got the same problem with Version 2.0.3 (262427) on my MBP (mid-2011) running 10.8.2. My helper app quit letting me take crosshair snapshots and Skitch would not Quit. So I followed the advice in this forum posting and stopped the helper and then trashed the Skitch application. Then I downloaded Skitch from the app store. It worked okay yesterday. Today, same problem: Cannot use crosshair snapshot (I don't use the other options) and when select Quit from the Skitch menu it does not. I have to force quit. I've begun to use this regularly and hope there is a way to get this fixed.