PDF Files not displaying in Directory Opus v12

Hello - I just upgraded to DO V12. My previous version was V11.
I cannot view a PDF file in the DO viewer pane.
I have checked the Active X setting as discussed in previous posts and this has not fixed the issue.

I have Adobde Acrobat XI Pro installed (which works fine).

This PDF viewer worked fine in V11 of DO.

Please help.

Thanks in advance.

You need to install Adobe Reader. Acrobat isn't a PDF viewer.

(Or another PDF Viewer that includes a preview handler.)