Rut ro... I think I may have a problem with my brand new CF IV.

I can't seem to change the wattage OR voltage setting; it seems to be utterly stuck at 10w -- which is where I usually leave it, but when breaking in a new wick I always decrease it to 9 or 9.5 and only go up after the wick starts
vaping really well. Is there some kind of "lock" setting that isn't mentioned in the little manuaal, or do I have a problem? I've turned it on and off, both with 3-clicks and the off/on button on the bottom; I've switched to voltage mode, and it's also stuck, at 5.5v. It'll do everything else it's supposed to... except change the wattage or voltage.
Andria