Document preview not working in DTPO v2.9.15

After the recent upgrade to DTPO 2.9.15 I no longer see the PDF preview anymore when I first select a document. I can see the thumbnail images in the sidebar. If I select a second or third page of one of the thumbnails I then see the document preview. However, if there is only one page I can’t do this. I can open the documents in Preview or any other PDF viewing app just fine. Could there be a setting that I might have inadvertently changed?

See 2.9.15 broke PDFs in OSX Sierra again

Thank you! This seemed to do the trick.

Sure thing. Cheers!