We've noticed some issues pushing media files to the CDN. We've submitted a ticket and are following through in order to resolve  this issue as quickly as possible.
Some users are reporting an error that looks something like this:

An HTTP error occurred while getting:
http://mediacloud.origin.cdn.level3.net/username/filename.mp3?nvb=20090323230643&nva=20090324231643&t=0d629aae64ad50fef950e
Details: "connect timed out"

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UPDATE (9:39pm) We are still in communication with the CDN. They are still investigating the outage, and we are working with them to find a resolution as quickly as possible

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UPDATE (12:25am)
Our CDN had a failure at one of their datacenters, which lead to some problems uploading new files for some users.
This issue should be resolved and uploads are succeeding. We are running some scripts to try to catch any files that failed to upload
so that we can try to reupload them.
Any new uploads should succeed. If you have any problems please contact us at support@libsyn.com.

UPDATE (9:00am)
The issue has been resolved, and uploads are