i.e. in System Preferences. Although why both would change at the same time is a mystery...

Rob

On 13/09/2016 1:07 pm, Susan Hastings wrote:
Have you checked the mouse settings on both computers?

Sent from my iPad

On 13 Sep 2016, at 12:17 PM, Juliet Kitson <billand...@gmail.com> wrote:

Help please today for some reason both my MacBook Air and iMac have developed 
mouse problems left and right have swapped and this applies to an external 
mouse left and right keys don't work properly ,both are running El Capitan 
latest version.
Regards Bill
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