OSX does not recognize the Scroll Lock key on my external USB Keyboard

Question

I am trying to share my monitor and keyboard/mouse between my PC (Windows 7) and Macbook Pro (1,1 - 2006, Snow Leopard) using a basic KVM switch (Trendnet TK207).

By hitting Scroll Lock twice the KVM switches from one computer to another. The problem is this works on Windows but not in OS X. OS X does not recognize my Scroll Lock key at all (even the Scroll Lock light doesn't work).

Any ideas on how to debug/fix this problem?