I have the same problem too. You're right I used it at a gig and MAJOR LOCK UP. Can't use it a gig except as mp3 player for break. I'll bring my ipod instead. I can't belive I paid $1600 to be a Beta tester and not be able to use the unit for the next 2 months or so until os upgrade and Marker/jump functions(one of the main reasons I upgraded from xd3) are available. Fustrating. Anyways Aloha from Hawaii and we'll just have to wait.