Final Cut Studio Keeps Asking For Serial Number
Go to the following location: Macintosh HD/Library/Application Support/Pro Apps.
Delete the file Final Cut Studio System ID.
The next tme you launch one of the apps it will ask for your serial number - hopefully for the last time.
If it happens again, something is causing that file to be corrupted, probably by writing its own data there.
Try the above anyway, it might just stick this time.
E: Pat got in first....