I have a logitech wireless keyboard/mouse combo. If I touch the mouse at the chameleon screen, the system freezes. If I am careful not to touch the mouse, everything works well. Once I select the partition to boot, I can move the mouse with no issue.
I should not say system freezes... just keyboard stops responding so I can't select which partition to boot with arrow keys/enter. After the countdown and the default partition is booted, keyboard works fine in the OS.