Exception Type: Nil Object Exception

1: Function MainWindow.MainWindow.Event_CancelClose( MainWindow.MainWindow, boolean ) as boolean

User description of above error trace:

a. closing astroplannet
b. Opened a plan, then closed it, answering Yes to the question of whether it should be saved first.

NOTE -- Win 7 has a new feature whereby it is possible to get a list of recently opened documents when you start an app. If you select a document, the app is started with that document open. This is the way I opened Astroplanner. Also note, although the correct plan was opened, the *last* plan open that last time I quit AP was also opened.
c. Closing apd file and checking to always save when closing