[CLIENT] Attack Move not working on a Mac?

After the last patch myself and several others who play on a Mac saw attack move just stop working. With the default key bindings, if you press A and then left-click on the ground, the champion will move there but not attack any champions or any minions the champion ran into along the way.

MacBook Pro (Retina, 15-inch, Mid 2015) OSX 10.10.5 Patch 5.16

On one of the Mac's, it appears to be fixed by erasing the mapping, saving the setting and then re-mapping it. I can't confirm for sure, though.