i have the kenko extension tubes too and i use it with my 7d
for the 10-22 any one of the extension tubes will put focus inside the lens. ie. u wont be able to focus anything at all even with using the shortest tube since the camera would never be able to get close enough to the subject to be able to get a focus on. if u have a kit lens 18-55 or something try using that @50mm+ and it should work.
with the 24-105, area u trying this with the lens set at 24? if so, u will also encounter the same issue.
i dont have the 24-105, but with my 24-70 the minimum focal length i need in order to be able to focus when using the 36mm is at 47mm and with the lens right up against my subject (in my case a screw on one of my lenses)
so try redoing your tests with the zoom set at the long end and then gradually work wider to find the minimum required distance. more likely, it is because the extension tubes are moving the minimum focusing distance so close that the theoretical point would be inside the lens.
you have to consider that the focusing distance is not measure from the end of the lens to the subject. it is from the sensor to the subject.
let us know how u go