There is a known issue with Final Draft 7's on-board help section on Leopard. Here is the workaround:
If you expect to be using the Help section frequently, you may want to create an alias and put it in a convenient place.
This issue does not occur on Snow Leopard (OS X 10.6).
NOTE: Live support for Final Draft 7 has been discontinued. You will still be able to install, activate and use FD7 on appropriate computers but email, chat and telephone support is no longer available. Live activation assistance is still available via phone (818-789-6281) and email and chat (links on the left side of this page).