I got a Sony PRS-505 reader a few weeks ago, and the Sony eBook Library 3.0 software worked fine on my Mac, until today. Now, when I launch it, the menu bar is displayed, but there is no application window and the menu items have no effect. I've reinstalled the software, but that didn't help. I've deleted ~/Library/Preferences/Sony Corporation, but that didn't help. I suppose I could start using Calibre exclusively, except it would make it difficult to buy books from Sony's ebookstore. Any ideas?