@WebDev You need to paste back here the plugin tags you're using and tell me the base path you've set in the plugin parameters as well as the location of the actual file(s). It looks like misconfiguration...

@Michael Haupt Your post is confusing. Which is it? MP4 or FLV that you're having issues with? Our demo site clearly indicates that AllVideos has no issue displaying MP4 files. FLV files are a different story. They require Flash and a paid JW Player license (used to be free but now that's no longer an option - one of the reasons we're removing JW Player in the next update). Flash is not triggered by default in browsers nowadays, so you should avoid FLV at all costs.

You need to add {mp3}song{/mp3} - the point is that you don't need to specify the file extension as you already do so in the plugin tags.

It's all here BTW: www.joomlaworks.net/support/docs/allvideos

You're welcome.