As a new 990 owner, one is prone to do strange things whilst trying to understand and configure the unit.

I was playing a CD in my DVD player via an optical input, and variously had the 990 in stereo, bypass and upsample modes.

I subsequently switched to a DTS DVD, and ended up with sound in the centre, surround and subwoofer only. The main LR speakers were absolutely silent!

The only way I could recover was to switch the 990 off and on again.

Is this a known defect?