Graphical glitches in the intro/first section of the game
There are some graphical glitches in the intro/first section of the game. See this post on the DF Forum for the screenshots:
We were unable to address this issue at this point.
I hope there may be a mac patch for this kind of problem soon as I have had graphical glitches since I got the game, in the intro and the first section of the game. A lot of geometry flickering in and out of visibility but it sounds to be a common issue with mac versions.