Please be aware that the update in Download Center applies to Microsoft Installer (.msi)-based edition of Office 2013. It does not apply to the Office 2013 Click-to-Run editions such as Microsoft Office 365 Home. (How to determine?).
Improvements and Fixes
Fixes the following issue:
Assume that you create an Office document that contains ActiveX controls. After you install Microsoft Office 2013 December 9, 2014 security update, when you try to insert an ActiveX control into the document, you may receive a "Cannot insert object" error message, and the ActiveX control is not inserted. Additionally, the existing ActiveX controls in the document are not enabled. For example, when you click a command button that is associated with a Click event, the Click event is not triggered.
Important For this fix to be fully effective, you also have to apply the other patches for Office 2013 that are listed in the "Resolution" section of the following Microsoft Knowledge Base article:
3025036 "Cannot insert object" error in an ActiveX custom Office solution after you install the MS14-082 security update
Microsoft scanned this file for viruses by using the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to it.
You may have to restart the computer after you install this update.
Microsoft Office Home and Business 2013, Microsoft Office Home and Student 2013, Microsoft Office Home and Student 2013 RT, Microsoft Office Personal 2013, Microsoft Office Professional 2013, Microsoft Office Professional Academic 2013, Microsoft Office Professional Plus 2013, Microsoft Office Standard 2013