I just loaded 18 movies on my 8 gig micro sd card and out of the 18 movies, only ONE movie plays.
All the other movies get (An error has occurred attempting to play media).....or...."Loading" flashing on the upper right corner constantly as well as the play button flips back and forth from play to pause.
Oh and btw, all videos stored on the card are MP4 format
You have to make sure they are a codec that the BB can use. The BB can be really stingy when it come down to the correct codec. I know that .3gp files from my winmo phone won't play on my bb. so it depends.