I tried watching a video clip with an AC3 3/0 track (L+C+R with no LFE). Regular Dolby mode worked fine, but selecting PLIIx mode would only expand the L+R channels to all 7 speakers (center channel was disgarded). This, of course, resulted in no dialog. Is this a limitation of Dolby PLIIx, or a bug in the 990's software? Can anyone else confirm this?