When you use Microsoft Dynamics CRM 2011, Internet Explorer 9 may reload and cause CRM to crash
KB Article: https://support.microsoft.com/kb/2698959
When you open or close Microsoft Dynamics CRM 2011 records, the CRM application may crash and Internet Explorer reloads. A script error may also occur, similar to below:
<Message>Object doesn't support this property or method</Message>
or
<Message>'lookupstyle' is null or not an object</Message>
Please see More Information for additional script detail