1. Launch SetPoint (Start > Programs > Logitech > Mouse and Keyboard > Mouse and Keyboard Settings).

2. Click on the My Mouse tab at the top.

3. Choose the Mouse Button Settings tab at the left and select the M310 from the Select Mouse drop-down menu:

   

4. Select the button that is not working from the Select Button field:

   

5. Select the task you wish to assign from the Select Task field. In this example, we selected the Zoom function:

   

6. Click Apply to save your settings. Click OK to exit SetPoint.

Additional Information

If the above solutions do not resolve your problem, consult Knowledge Base article 17892 for instructions on contacting Logitech Technical Support.