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Editing the Properties of a Coveo Search MVC Component Freezes the Page Editor in IE11

Symptoms

When selecting a Coveo Search MVC component in Edit mode, the Page Editor freezes (as well as the whole browser). The usual floating toolbar appears, and then the browser becomes completely unresponsive. This occurs only when using the IE11 web browser and editing a MVC Coveo Search Page.

You may also see the iexplore.exe process peak at 10-30% of CPU usage in the Task Manager.

This behavior prevents you from editing a Coveo Search page altogether.

Cause

This is caused by an undocumented issue in Sitecore 7.5.

Resolution

As of now, there are no fix or available workaround. You are strongly advised to use a different web browser, such as Google Chrome or Firefox.