This issue may occur when you disable the page zooming feature by using Group Policy or by using a registry key.
To disable the page zooming feature by using Group Policy, enable the�Turn off page zooming functionality�option in the�following Group Policy:
User Configuration\Administrative Templates\Windows Components\Internet Explorer
To disable the page zooming feature by using a registry key, set the value of the�ZoomDisabled DWORD to 1 in the following registry location:
HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\ZOOM