There have always been cases of this happening, although in some cases people have been able to resolve it by adjusting the placement of the microphone. Some folks have had autosetup work better in their systems with the new firmware. Mine behaved the same (although I used a camera tripod in both cases to get the microphone up to ear level - and above the back of the couch). There have also been several reports such as yours in which the autosetup claimed small mains and large surrounds with the new firmware. I'm not sure if there even was a change to the autosetup in the firmware. Of course, it would be cool if the autosetup could be refined in a future firmware release.