Help!! Problem with my Yamaha HTR-5760

It took me a week to notice this problem. I have a 7.1 setup and when listening to DD or DTS with PLIIx-movie and then I turn on the ENHANCED DSP I lose sound out of the left front speaker. Actually, it becomes about 90% less. Switching back to STANDARD the left front speaker comes back on. I tried setting the surround backs to none and tried it with PLII with 2 channel sources and got the same result, no sound with the front left speaker when using the enhanced mode. I have owned two previous Yamaha models and the enhanced mode enhanced all the speakers. Can anyone verify this on their reciever. I would like to know if this occurs on all the 5760's or just mine. If anyone else has this problem, please report it here. In the mean time I'll have to listen in the STD mode.