When attempting to play .mp4 videos from a microSD card, I get the message "files that cannot be play will be skipped".  The video files are formated to h.264 video and AAC audio, as the manual suggests.  Am i missing something?

u need to set the video bitrate pretty low (under 1000 kbps) to be able to play them.  Check out the stickies threads to see what settings work.

Thank you.  I am new and almost embarassed to ask but what do you mean by "stickies"?

stickies are threads pinned always to the top, like this one

http://avic411.com/index.php?/topic/26312-confirmed-generic-divx-format-for-sd-avi-and-dvd-divx/

Thank you very much for you time and effort