Aplogies for the late reply but I was unexpectantly away for a week. The problem seems to have resolved itself without me making any changes. Apparently it started working one day, gave the error 403 the next day and has been fine since. If it reoccurs I will try to report it as asked.
Thanks for your time.

Odd, then capture this in a debug log (step 4b) and attach the log to a Support Ticket: https://www.mediamonkey.com/forum/viewtopic.php?f=1&t=69

I have never before needed to login for BBC podcasts and my other (non-portable) MM library on my desktop is still merrily downloading. I certainly haven't logged in to any podcast feed for that one. The couple of non BBC podcasts that I subscribe to have also stopped downloading as well.

Have you tried any other (non BBC) Podcast feeds? Do the BBC feeds require login?

Oh, and I've checked that the [PodcastMasks] Mask 1 is set to the correct directory in the MediaMonkey.ini file.

I've just moved my portable installation of MM 4.1.24 1883 to a bigger external drive and given it a different drive letter. I scanned the drive to locate moved / missing files without problems however since the move I have been unable to download any podcasts. Similar to http://www.mediamonkey.com/forum/viewtopic.php?f=1&t=82883 I get '403 Forbidden' as the error message but it is for all my podcasts not just one particular feed, although they are all from the BBC. The downloads get queued, then say 0% before disappearing and I then get the error window for all the feeds. I have checked that the the download and podcast paths are correct using the browse button rather than just manually changing the drive letter. I have tried different directories on both the external drive and internal drives on my laptop without success. I have run the 'Optimise database (Complete) and run MM as an Administrator, again with no success. I have unsubscribed and resubscribed to various feeds also without success.

Any ideas?