For @irishdomer08 and @Mirefox
I'm working up a game with the AI...I'm betting it's a bug with the Giants ability and the 6 power action specifically.
EDIT; Yep. Bug. I have a screenshot.
I'll also bet it's because you don't have 3 workers, though that shouldn't matter.
EDIT 2: Yep. As soon as I had enough workers for 1 spade, magically the 2 space power option works.
Hmm. I actually have enough for 2 spades. That throws it off.
EDIT 3: Traded workers for gold to 5 workers. Still worked. Trading down and testing.
EDIT 4: At 4 workers, I can no longer do the 2 spade action.
Final Edit: bug report submitted.