I've gotten both on my Mac. The Ace Zafara game got changed and I think it made it a little easier to get ever since (I got it a couple weeks ago). I never thought there were problems with Whack-A-Kass. But I have fairly fast computers so that could be the reason why I didn't notice a problem.

The difference between Mac and PC has definitely caused problems in other stuff too - That Roothless challenge glitched at the start of level 5 for everyone who used a Mac to play it.