I was using the program and noticed when the file size got bigger than around 35mb, it would place an 'x' in the list and keep skipping each item in the list till it found a small enough sized file to play. It was unnerving to watch it keep skipping down the list. Why does this need to be the case? why not give a setting option to address file size. Why would you want large podcasts to be downloaded before watching? you can always right click and download if you want a copy. Most people would simply want to watch it without having to download it first. The internet is getting faster so file size is not such an issue any more.

a good rss test site to show this is pbs.
http://feeds.pbs.org/pbs/wgbh/nova-video/

if i used mplayer to open any of these feeds they play just fine streaming