Could you please verify that you have
"Optics" or "Optics temporary" bound
Few other tips
- The "Optics Mode" is a switch - you have to enter the optics to see the result (RMB click or Num0 by default)
- RMB Hold can be bound as a different action (by default holding breath and zooming in), make sure you only "click" the RMB when switching the optics mode.
I was not able to experience any issues on Apple MB110. What type of KB do you have?