It's funny I read this today. Up until now I never had this issue. I've got 10 "tv series" videos (22 mins each) and 2 full length movies on my 8 GB - class 4 card - still not half full yet

. Only takes a few seconds to bring up the sideloaded movie names. As I was getting ready to go to court today (back off, just a character witness

) I thought I'd finish watching tropic thunder as I was waiting for my time on the stand (I bought the dvd and converted - dvdshrink - handbrake). Copied to phone. Went to test before leaving and after 5 minutes I still couldn't bring up the list of movies? Deleted newly added movie and all was fine again. Tried to play converted one on PC and it said it wasn't a valid MP4??? Reconverted movie, reloaded on phone and is fine now. Seems the phone chokes when there is a corrupt file?
Possibly one of your movies is corrupt?