I know that this specific model of Pioneer's new model range is n/a in the US, so chances are probably low that anyone here has this device. However, it would be interesting to know if anyone can confirm this issue on any of the other new Pioneers, or if anyone knows of a similar issue with previous models. Also, I remember that I saw folks from Pioneer contributing here, so they might be able to comment on this.
The bug is that after performing the MCACC calibration (the full auto one, haven't tried any other method) the device gets "laggy", i.e. it reacts on any inputs on the remote AND on the device itself either with a huge delay, or not at all. Basically, the device is no longer usable after performing the calibration.
After performing a reset, everything is back to normal, but only until I perform MCACC again.
So for me it would seem like any of the features that is being enabled after performing MCACC causes a almost-100%-CPU load, just like a buggy Windows software... :-)
The calibration itself runs through without any issues by the way. And as far as I can tell it on the then-unusable device, the sound is noticeably improved.