I am curious. It is normal if your speaker levels change? I have a Pioneer Elite vsx-35tx receiver that I have calibrated the speaker levels using my R/S spl meter. It is set at 75db, c weighting, slow response. I have NOT moved 1 piece of furniture or speaker as I know this can change things drastically. The last time I adjusted the levels was about 6 months ago. I was watching 2 Fast 2 Furious the other night and noticed my front right speaker was much louder the my left. I grabbed my spl meter and low and behold my front left speaker was reading 69db's and the rest were at 75db. Anyone else ever notice this with Pioneer or any other brand for that matter. Or is it just me?

I've never had a Pioneer receiver, so I can't speak about them, but I've never had that problem with either my Kenwood or NAD Electronics receivers.

Is your receiver brand new? I'm wondering if it might just be part of the "breaking in" period.

(On a side note, I'm moving this thread to "Home Theater Corner" as it's more geared to that forum.)

You could have a problem with that channel. Has a setting been accidently changed? Maybe a loose cable or a speaker not working? I had an amp with a bad output stage once that was down a few dB on one channel. I would check all the settings first.

I have a Pioneer VSX-36TX and I have not had any problems like that.
Did you unplug your reciever?
Did any "unauthorized" fingers push any buttons or your remote for the system set-up menu?