Recently active topics in Pownce tagged with linking

I've noticed that when you post certain characters using the desktop application, they don't translate well through to your pownce page. Examples as follows:

In this note I posted the url http://www.last.fm/music/Mike+TV (notice the plus in the url between Mike and TV), whereas on my pownce page, it's showing as http://www.last.fm/music/Mike%252BTV, which is an invalid link.

In this note I posted the text "or available for purchase seperately for £4" via the desktop application. When I look at the note through my browser / rss feed, the text reads as "or available for purchase seperately for ?4" and the pound sign hasn't been recognised.