Here is an audio sample (recorded via the SPDif out of the KPA):
Audio1
Rig1, after KPA bootet up
(also, this is exactly how this rig sounded with FW 1.0.4)
Audio2
Rig1, after switching to another rig and back to rig1.
(also, this is how the rig sounded in FW 1.0.5)
Same guitar, same pickup, same cable, same pic, same player - you get the picture

Sorry for the lame playing.
Do you hear a difference? I definitely do.
Sorry for the noise - I have the noisegate disabled, and this is a highgain rig
Summing up: FW 1.0.6 sounds like FW 1.0.4 when the KPA boots up - and then goes back sounding like FW 1.0.5. when you switch rigs.