Final Draft v.7 is not supported on Mac OS X 10.8 (Mountain Lion) or 10.7 (Lion), it's too old. If you need to run Final Draft on a computer with one of these operating systems, you will want to upgrade to v.8, which was designed for 10.8 / 10.7.
If you're on OS X 10.6.8 or older:
This issue can usually be resolved by repairing permissions.
- Go to Mac HD / Applications / Utilities / Disk Utility;
- Choose the First Aid tab;
- Select your boot disk. It'll probably be listed as Mac HD;
- Click Verify and Repair Permissions.
- It may take some time to complete and when it's done, restart your computer.
- Go to Mac HD / Users / username / Library / Preferences and if it's there drag com.finaldraft.fd7.plist to the Trash;
- Empty the Trash.
Final Draft should now launch without any problems.