I've uploaded some MP3's to my album, but they don't play when clicked. I get a mis-placed floating "next/previous" buttons and I have to click on "View Full Size" for it to play back (albeit, in the browser's own player)

Am I missing something? I couldn't find any answers off the forums.

We need more info. What Zenphoto version and what theme? Generally you need on of our flash player plugins installed (included by default but need to be activated)

I've got the latest version and I'm using the CIMI theme (no theme works, actually). I've tried with both players activated (not at the same time, naturally), but they don't seem to pick out audio files for playback. I only get a small box where an image would normally appear.

You of course only get the player on sized image view (on image.php), not in thumbnail view. You should only have one player activated at the time (just to mention). Mp3s do work fine for me. I guess we need a link to the site to help.

http://geoffwinans.com/

It's in the "funny stuff" gallery. The audio plays only if I click "View Full Size", but then it's playing through the QT Plugin in firefox.

Well, first the Cimi theme indeed does not work, it's quite old and has not been updated by its author for some time (and probably will not anymore).

I can't reproduce it with the default theme and the flvplayer but indeed with flowplayer. flowplayer indeed containes a unnoticed bug that prevents mp3s from being played. Thanks for finding! Fix for that will be in tonight's nightly.