Disability Options unclickable items - using NIS 2011

Hi,

 

I have to use Disability Options to operate a computer. Since upgrading from NIS 2010 to NIS 2011, when I use the Keyboard to control the mouse, go into Settings -> Network Settings -> Program Control and on the dropdown arrow try to click from 'Auto' to 'Block' for any program, it fails to work! It's unclickable using the No 5 Key (Left Click) on the Numeric Keypad.

 

If someone is beside me, they can click to 'Block' with the mouse. However, I've not always got someone standing by me. Can you investigate this please. Thank you.