On my blackberry it isn't showing any of my videos or songs that are on my memory card. This just recently happened it was working just the other day now it isn't. Is there any way to fix this issue?
I've seen that happen with OS4.2.2 as it seems the Media Player only gets the list of available files when it first starts up.
Try closing the Media Player completely (including the Now Playing option) and then start up Media Player again. That should take care of it. Worst case, a battery pull should fix it as well.
