Chris' website RunRunLive
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cyktrussell AT G Mail Dot com
If Episode 5 does NOT have the date 02/20/2010 then you will not be able to download in iTunes. Right click the podcast in iTunes and choose "Show All Available Episodes". You should see Ep. 5 with the date and be able to click "Get" to download it.
You can also right click and "Unsubscribe" then right click and "Delete". When you re-subscribe, all episodes should work properly.