I found this little program that can help you avoid the HEXing. I used it and set the IN time of my original MPLS file to 10mins (600 seconds as it asks in seconds) and my movie and hcapters and popup menu work great now!
Check it out, it will help you too I believe avoid HEX editing :
http://forums.sagetv.com/forums/showthread.php?t=41722