Hello! I installed Final Cut Studio on my MacBook Pro about a week ago and it has been working great until today. When I tried to open Final Cut Pro today, a window popped up asking me for my name and serial#. When I entered the serial# I got an error saying "the serial # is invalid". When I tried it again I got the error message "Licensing Error: this application cannot continue because the software serial number is unusable". I have been using FCP everyday for a week and this is the first time I have encountered this problem. I have tried re-starting my computer, trashing the Final Cut Studio System ID file as suggested on other forums, but it didn't help. Any ideas?