Hi, So I'm running Mac OS X Lion 10.7.1 on my 2009 13'' Macbook Pro. Some times, some apps like Skype, Word or PowerPoint (all apps that aren't from the AppStore) won't launch. The icon jump in the dock on there is a little blue dot under it but it won't launch. Now, for it to launch, I have to uninstall it (and delete the preference file) and re-install it again! It's a workaround but it is extremely unpractical. If any of you have the same problem or know a fix, I'm all ears!