Playback Error in Zune on some podcasts

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Hi I started to have a problem around 2 weeks ago. My HD7 started to say Playback error on most of my podcasts.
I'm using a WP7Conector for Mac so first I thought that its some kind of iTunes - WP7C incompatibility but when I emptied my Library and connected to my Windows7 laptop with same podcasts but this time downloaded via Zune, same problem.
It seams that if I'll download mp3 from website and sync via Zune or WP7C it will be playable.

( podcasts with problem include Engadget, Engadget Mobile, Joysq, 10 O'Clock Live, Comedy of the week and few more)

I really don't understand that especially that for example Engadget HD works fine

ok I still don't understand why its happening but I come up with a little way around it. in iTunes you can subscribe to RSS MP3 version of podcasts manually. All the podcasts with were not working are now fine, it take 5 minutes but at least it works,