The RSS has been fixed. For you podcasters out there that might want to use two servers: one to host your blog and one to host your audio files, here’s what you’ll need to do:
Get your blog’s hosting company to add your other site as a trusted domain for their firewall. Your blog software (in my case, Moveable Type) needs to report back the size of the enclosure, so that it can generate the RSS. I moved my latest audio file to a new server (coverpod.com) but until it was added as a trusted domain, Moveable Type couldn’t get the file size and create the RSS.
In layman’s terms (which I need), it’s fixed now.