Nope, that was the first thing I checked. Also, like I said, I've tried other servos in the channel 1 slot and they've worked when the HS-5645MG didn't.

I've heard that some Hitec servos don't play nice with some receivers, so I'm wondering if that's the case here. But then again, I find it odd that it works on channel 3, but not on channel 1.