So I just upgraded to v1.06 of Book I (from v1.04, I believe...), after having not played Book I in well over a year (actually, it was almost 2 years!), and I quickly discovered that I had the Glitchy graphics
problem under v1.04 and Mac OS 10.6.8.
And, sure enough, the graphics problem reported here
(and elsewhere) cropped up when I first used v1.06.
Restarting the game app did not fix the problem.
(I didn't try restarting the whole system to see if that would work...)
However, I'm happy to report that the solution reported in this post did
indeed work - so if you see this
, just try toggling the "Color Depth" and the "Screen Preference" on Book I's intro Launch Menu to see if it clears up the problem...