...As far as hitting the idle up switch accidentally I'm not sure how that could cause the heli to fly around the room. If the heli was pretty much shut down like you say hitting the idle up switch would simply push the heli into the ground due the the negative pitch of the blades. Unless you were already at over half throttle the heli would have simply fallen hard to the ground.
...
You know, I thought about that. But this is the only explaination that I have. It happend real fast. The heli rose about 4.5 feet off the ground and my first action was to swat it down before it hit my TV. It sounded like it was at full power. When I got my heart slowed down and started picking up the peices, I tried to restart the heli (with the bladed removed) - The throttle and trim were in full OFF position. That was the setting when I set the Tx down. When I powered back up, it wouldn't init (solid red light). I then saw that the 3d switch was in the wrong position. Switching it back, then all was okay. I'm going to take my heli outside and try to duplicate this.
I have read in other posts about people saying that the CP will "jerk" at times. I have experienced this myself. But the motor jerk was real short in duration. Just enough to make the blades go cock-eyed. This was long enough to take off and rise to 5 feet or so.