Updated to version 2.0 and unable to play music

Updated to version 2.0,after that I'm able to download videos but it doesn't play them.No error comes up it just doesn't work.Videos which I downloaded prior to updated still play, but new 1's don't. Please help me, had problems b4 with last update which took so long to fix but with yr help I was able to fix.much love of this app,when working properly.thanx