I just recreated the drop out by playing the same cd (JohnK's EMI Bach Cello Suites) and then popping in the Planet Earth Blu Ray. NO bass again. Instead of turning the sub off and back on, ejected and put in Transformers 2 Blu Ray. The 500 now played as it should? I guess tomorrow I will try boosting 6db and dialing back the trim. I did send an update to JC.....still frustrating. For the record my receiver is a Yamaha RX-V663 and the Blu Ray is the Oppo.

"A fanatic is someone who can't change his mind and won't change the subject" Churchill