To fix this issue
1. Open Final Draft 13 and sign in if asked.
2. In the menu bar, go to Help and select Sign Out.
3. Restart your computer.
4. Reopen Final Draft 13 and sign in once more when asked.
5. Restart your computer.
6. Reopen Final Draft 13.
You should now be able to close and reopen Final Draft 13 without being prompted to sign in every time.