That's interesting. I don't have a prs 505 on me, but I've reproduced
the same bug in Adobe Digital Editions. It's also interesting that I
couldn't get that page to come up from the "text" link on Instapaper
either. I guess there's something about the markup on that page
that's tripping up the text parsers. I'll try to get a bugfix in for
the next version.
-James