You wouldn’t know it from reading this review, but according to a source, Madonna’s opening bit where she emerges from a disco ball was plagued by technical difficulties at a show last night in Denmark. No one in the record 85,000 crowd seemed to notice, but our mole says that there was serious concern backstage that the ball wouldn’t open, which would have made for an excellent Spinal Tap moment. We shudder to think what the conversation was like later that night between Madge and the hapless disco-ball operator.