Collections with images don't like to get exported to PilotDB format in Bookcase. And they display their unhappiness by crashing the application. So be nice to your collections and don't export them with they have images. I'll have more well-behaved collections in the next version.
UPDATE: Actually all my collections are extremely bitter over a political dispute and they refuse to work. I'll just have to hire scab collections next time. So consider PIlotDB exporting totally broken at the moment.