I started using Crossover Games Mac 9.1.0 a few days ago and have noticed that character footprints just show up as light coloured boxes on the ground. When I revert back to 9.0.0 the footprints appear fine.
The system I'm seeing this on is an iMac with Mac OS X 10.6.4 and Nvidia GForce 9400 graphics card.
I'll test tomorrow on my Macbook Pro to see if occurs there as well.