I’m having a similar issue. I have a WebVTT file, a controller, and do not have Auto Start or Rollover selected in my playback options. Everything works perfectly in preview/run mode, but when I publish my course for HTML, it doesn’t work. It works fine in Firefox, but that doesn’t help me when we use IE. I can’t figure it out. There is a preview button in the Publish Title to HTML box and it works fine in IE and Chrome, but the files run through localhost. It’s the only thing I can tell that is different. I’m wondering if it has to do with the network. You’ll have to keep me posted if you come up with a solution. Sorry, I’m not much help, but I feel your pain. Hang in there!