I am running awesome 3.4.15 (Never Gonna Give You Up), and most of the hotkeys seem to work fine, including Mod4-j, Mod4-enter, Mod4-r, Mod4-x.
However, Mod4-Space does nothing. The window tiles do not change, and the layout does not seem to either, as indicted by the layout icon in the upper right corner of the screen not changing. If I click on the layout icon, the layout does change, however.