There has been no change to the Attack button but there was a recent change that greyed out Punch/Hitlist if you are not healthy enough to perform this action which is the same reason why the Attack button is inactive. I'll do some more testing with that but it was requested that we grey out actions that players cannot currently perform.
If it turns out this is too confusing overall we can always revert the change but it will likely stay this way until at least Monday. In the meantime please continue to give us your feedback.
Update: Yeah this is not functioning as intended. It will be reverted until it can be looked at in more detail. Apologies for the inconvenience.
Last edited: Nov 15, 2014