[quote=Tripp] with those tell-tale blanks every few spaces.
It is probably what SOLARPOWER said, it is 120-240 and high leg 208 to ground.
Check supply to the panel if all voltage is present then the breaker is either bad or is not making a good contact or burned contact on the bus bar.
If not above, then as suggested by others work yourself up the stream to find the problem.
Niko
I agree with Niko on this. It sounds allot like a breaker that has a worn out/loose connection with the bus bar. One of those 120V to ground readings is coming back through a load in the unit. (As e57 also described) 