Final Cut isn't working!

So my brother bought Final Cut Express awhile back, and he put it on our family account. A few months ago I made my own account and transferred Final Cut over, and it worked just fine...

But right now it will always crash and won't open on my account, it will open on my family account though! Does anyone know how to correctly transfer an application from one account to the other without the application quitting unexpectedly? Or is something wrong with only my account that won't allow it to open?