I bought a 950 off eBay about 7 months ago.
Recently I have noticed something weird.
When I turn the 950 and Amp on, and play a DD/DTS DVD, there is no sound coming out of the center speaker.
There is sound coming out of the L/R/SL/SR speakers.
The only way I have found to fix this is to change between Stereo mode and DD (or DTS) a few times.
Then the center speaker kicks in.

If I turn the 950 off and then back on, I have to go through this process again.

This only started happening last week after I played a CD (from my DVD player) that was recorded in Dolby Surround.
I used the PLII setting for this. (It was not a DVD-Audio).