There were, it appears, a number of issues some folks were having with the most recent podcast episode. Like an idiot I added ID3 tags, which some podcast players don't like on M4A files. Thanks to Roger B-W for spotting this. When I built the new server, I missed copying one change to a small but essential configuration file off the backup, which meant the episode wouldn't play in Firefox. Thanks to Dave Brown for reporting that. I also changed the server that handles the podcast files from HTTP to HTTPS. This shouldn't make any difference, but you never know :D Some podcast feed services cache the incorrectly-tagged version, so even though I fixed it you still might not have been able to play it. Thanks to Neil McGurk for flagging that this may be an issue. So. Here's a fresh post, so it creates a new podcast feed entry, linking to a copy of the correct file, so the feed services can't cache it. If you've been having problems, try this and see if it resolves it.