Ah, the mystery has been solved. Apparently, in order for another writer to make changes to the script, one must click the button and unlock it. So, the other writer takes over and makes changes, but why can't I see them? I have to close the document and re-open to see the changes another writer made. And then I have to unlock again for them to resume writing. There is no way to refresh or know what they are working on? Not exactly collaborative is it?

I was really hoping for the solution to writing in real-time with three writers on a team, but this ain't it. If I need another writer to look at a script I have made changes to I can email it to them. What we need is the ability to have one writer making changes to the script while the others watch in real time. This way the group can discuss, via skype or whatever and then see the writing happen while the discussion goes on.

Oh well. Maybe one day.