ActiveX preview is not working (DOpus 12)

I just uninstalled DOpus 11 yesterday and installed version 12. Everything works just fine, except for the ActiveX plugin. Whenever I try to preview an MS or PDF file, I get the attached error message.
I did check all relevant entries here but I couldn't find a solution. Could you please tell me what went wrong?
B.S. I've reinstalled the PDF viewer (PDF Xchange viewer) twice, and tried modifying the Active configuration according to Leo's advice in former posts (IE 32 and ActiveX generic) .. Also, the preview is working in Windows File Explorer.

What does the plugin's configuration look like at the moment?

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