In Devonthink Pro Office when I selected “open an external editor” I used to get Adobe Acrobat 7.0 which I have. Now for some reason I get Preview. How do I reset it to Adobe Acrobat?
Preview is the default PDF viewer in OS X.
To change, e.g., to Acrobat, this is done in the Finder. Select a PDF and open the Info panel. Choose ‘Acrobat’ as the parent application. Then, immediately beneath that option, select the option to make all PDFs open under Acrobat.