Using a Belkin KVM switch. Normally, I'd be able to double-tap scroll-lock and choose a number corresponding to the machine I wish to switch to, however, since I upgraded from 12.10 to 13.04 Beta 2, double-tapping the scroll-lock no longer changes machines.

I had assumed that this "double-tap" was hardcoded into the KVM unit and it should always work, but it seems I was wrong.

Anybody have any ideas? The KVM is a Belkin 2-port 1DL102P (with built-in cables and audio support), and doesn't have any buttons on the unit itself, so there's no "manual override" or "hard reset" buttons.

Looks like this:

Any thoughts, ideas, or suggestions? Is it some kind of key-binding glitch?