RAW issues on 5D Mk III

So, I have all updates of OS X 10.8 installed, latest EOS Utility, brand new 5D3 with updated firmware and formatted card.

Shooting in RAW.

When it comes to transferring via USB to my computer it gets stuck without fail.

There is no problem with previewing the RAW files within EOS Utility and I have tried resetting settings on the camera, reinstalling software etc.

I can't think why I can't transfer my RAW files.

Any thoughts much appreciated.