GpgOL starts on some computers with Outlook 2013 not automatically

We use Office 2013 32 Bit under Windows 7 64 Bit and Windows 8.1 64 Bit German with local user accounts and have on some computers the issue that the Outlook Add-In GpgOL of Gpg4win 2.2.2 does not start automatically.

The Add-In is not deactivated. You can start it manually via “File \ Options \ Add-Ins \ COM-Add-Ins” and making checkmark at ‘GpgOK’. But every time you start Outlook you have manually to start the GpgOK Add-In. Is there a way that it starts automatically like on other machines? We also tried to deinstall Gpg4win 2.2.2 completely from the computer and then reinstall with no change on that issue.