I see, OK try making the change and then restarting in Safe Mode. This will clear some caches, it is possible one if corrupt. To restart in Safe Mode hold down the Shift Key when you hear the startup tone until a progress bar appears and let the machine boot. Then restart normally and test. If that does not take care of it look in the apps preferences and see if there is anything about launching on startup. If there is nothing there look for the app on the Dock and right click and ensure it's not set to launch on start up. Finally if that does not do it you may need to remove teh apps Plist file as it may be corrupt.