When Exporting a project to MPEG-4, under the advanced tab, there is an advanced multiplexer tab which calls a window made by a company called Main Concept, the Codec People. In that window, I found an option to put MOOV before MDAT in the MP4 file. As I understand it, MOOV is the index data, and I want it at the beginning of the file to allow browsers to play it from my website without reading to the end of the file. I selected that option and made my video. When I returned to the Advanced multiplexer settings, I found that the choices had changed completely, and the MOOV before MDAT option was not even shown. In addition, the Advanced Video settings had changed. On the main export window, I hit reset and everything went back to normal. I then checked all of my settings again and made my video. Again, when returning to the advanced settings, I found everything changed again in the same manner as the last time. Is this a bug in the program? Has anyone else run into this?