This is most likely a configuration-related issue. Check your mouse settings in Logitech Mouse and Keyboard software (SetPoint). To check your settings, please do the following:
NOTE: Your mouse will be identified in SetPoint as M705.
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Launch SetPoint (Start > Programs > Logitech > Mouse and Keyboards > Mouse and Keyboard Settings). If you do not have SetPoint installed, please download it from the MK710 Downloads Page.
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Click My Mouse tab at the top and choose the M705 from the Select Mouse drop-down menu:
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Choose the mouse button you wish to customize in the Select Button field:
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Choose the task you wish to assign in the Select Task field:
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Some options may generate submenus. If so, choose your settings in the submenu.
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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 16805 for instructions on contacting Logitech Technical Support.