MP4 issue

Hello, I’m fairly new to this.  I have some mp4 files that my WD Live won’t play. It will load up and then it justs kicks me back to the main screen.   However when I transfer these files to my other WD LIVE Hub they play fine.  This doesn’t occur on all of my mp4 files, just a select few.  Any suggestions.  

http://community.wd.com/t5/WD-TV-Live-Streaming/Firmware-2-02-32-Not-playing-all-mp4-files/td-p/778481