PDFMaker add-in will not stay active in Microsoft Excel 2013.

Load behavior shows as "unloaded", even though registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ofiice\Excel\Addins\PDFMaker.OfficeAddin value is "3".  I have also checked HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Ofiice\Excel\Addins\PDFMaker.OfficeAddin value, it is also set as "3".  Running Adobe Acrobat XI Pro.  I have tried running a repair on Adobe as well as on Excel.  I have also uninstalled Adobe and re-installed, all to no avail.  PDFMaker shows as an inactive addin, and allows me to activate, however, as soon as I close Excel, it goes back to inactive.  Any help would be greatly appreciated.  I am stumped.