I have a problem on a PowerMac G5 running Mac OS X 10.5.6 .
Whenever I go to an option screen, all options keep scrolling and focus change in an endless loop.
Using the mouse works, but this behaviour is VERY annoying .
I appeared after a few minutes in demo mode, and did not disappear with full version.
I tried to reinstall the game and all went OK for a few minutes, then the bug came again.
I tried to change video options to no avail.
Any idea ?