Please state, what exactly you're doing and how exactly it doesn't work and the version you're using. I got it working on my 50D with last year's stable versions, 2.3 and several nightly builds, so it's probably not a bug.
One of the most common errors is having the lens set to MF. It may seem logical, because you are focussing manually, but the camera needs the AF motor to focus, so it needs to be active.