[Missing] in the Customize Drop Down Menu ArcGIS 10.1

We recently converted to 10.1. In the Customize Menu, there is the following "Missing" in the Customize drop down list. It doesn't do any thing when it's being clicked on. No Error messages and it doesn't cause ArcMap to crash.

Attachment 22644
Ideas? I'm looking for the reason that would cause this to occur.

Thank you for your help,
J-

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