Actually only the "FI" styles work with Safari
I just tried Black Soul and it shows a blank screen after the page renders also. Its a bit odd because you can see the body text while it renders, but once the page fully renders all you see is a blank box. You do however still see the signatures, go figure.
I understand that Mac users may be in the minority, but we are still out here
I just happen to switch between Windows at work, and Mac at home so i can see the differences pretty easily. If you want a screen shot of what safari sees let me know
If only these companies can start to use a uniform web standard, then none of this would be happening.