I have a very peculiar happing with my videos. I have for the past several years made a monthly video file of my home movies to use with MC and stream to my XBox 360. As of May, everything was fine. I finished my June video and went to view it over my XBox and MC was only showing my last 4 videos. I immediately assumed that my files were deleted; They aren't. My last four videos were rendered in an m2ts / AVCHD format and Media Center is showing these. No other video format shows up in any of my video folders. Mp4 and mpegs are not working.

 I tried to remove the folders and add them again, no luck. Interestingly, I have Win7 on another partition and the files work on that Win7 partition, so the files are okay. Also, I can right click the files and choose to open with Media Center and they play that way as well.

 What else can cause this problem? Any suggestions are greatly appreciated!