Originally Posted by JSWolf
I could send you Calibre 0.5.14 which actually does a better job converting to LRF (sometimes) then 0.6.x does. You could try 0.5.14 and see how that works for ePub to LRF based on the Sigil created ePub.
Good advice... the only problem is, I actually don't have a PRS-505 to test it on. But if the interested parties see this thread, hopefully they can contact you (or Kovid) to get the app.