I also have the same problem, which started at about the same time as it did for you.
Just wondering if you'd found any way to fix the problem? If so, what was it?
When i try to play music on sonicstage it comes up saying 'there is invalid rights management information in the OpenMG content'
im really confused here guys, i have no idea how to fix it at all and because it does this i cant put any music onto my Sony NW-HD5.
can anyone PLEASE HELP ME, i have about 2000 songs on their but i cant use them to put onto my mp3 player, and the problem is aswel that i actually used sonicstage to put the cds onto the computer, i didnt get them from anywhere else so im really confused.
HELP PLEASE GUYS