I've just tried the url with the current beta & the preview build & it appears to play ok. Am not sure why it's showing the state it is though it's handled via one of the plug-ins being re-used from 5.666 so that might be part of the issue or there's something on their side that's been set to block access via a player that reports itself to be winamp-like (have known that to happen as some stations will view it as a streamripper).
I'd need an example of the podcast feed trying to be added to see if I can replicate it crashing or not.
-dro