Issue

JavaScript doesn’t work on Internet Explorer 9. Could have been a coincidence, but issue occurred after installing Sophos endpoint protection (antivirus) on the machine.

Troubleshooting

• Making sure Active Scripting is Enabled in Browser settings
• Starting IE in safe mode without add-ons
• Disabling Antivirus and Firewall
• Re-setting IE Security setting
• Re-setting IE Browser settings

Solution

Issue was resolved by re-installing IE9

Windows 7 SP1
Internet Explorer 9