There is a major bug with this firmware that nearly burnt out the motors on my wheel.
I updated this morning ran a few races in Forza 4 and then went to do some work on my computer. Wheel felt great after the update, really smooth force feedback.
After a few a minutes of the wheel being on and idle, I heard a strange loud 'thud' sound from the other room. I walked in there to the smell of hot/burnt electronics. My CSR Elite was cranked all the way to the left and was locked so hard I couldn't turn it. I turned it on and off and it failed to spin it's calibration start up but the fan came on. The air coming out of the vents was super hot and the burnt electric smell was really strong.
I thought my wheel was toast, but I let the fans run for a while until the air coming out finally cooled off. After turning on and off the wheel a couple times it seemed to come back and worked fairly normally.
I'm not sure how much damage has been done to the motors after cranking at full lock, but the FFB does seem weaker than before. I'm hoping this might improve after they cool down to a normal temp.. :/
Please post if you've had any similar issues.