If you are not using a rear-center speaker, you still need to tell the 1050 that there is a speaker there in the speaker config setup.

There is an EX-flag issue with certain DVD's which will continually attempt to trigger the 6.1 decoding of the 1050.....if there is not a speaker configured for it, and the DVD keeps trying to engage this decoding, you will get those drop outs for the entire length of the movie.