Hi Joe,
Dynamics CRM 2011 (with UR 11) isn't fully compatible with IE 10, but might just work in compatibility mode. IE 10 is fully supported UR 12 onwards.
From the
Microsoft KB Article
"As of Update Rollup 10, Microsoft Dynamics CRM 2011 is compatible with Internet Explorer 10 for the desktop in Compatibility Mode.
As of Update Rollup 12, or the December 2012 Service Update, Microsoft Dynamics CRM 2011 is compatible with Internet Explorer 10 for the desktop without Compatibility Mode."
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