Adobe Acrobat has encountered an unknown error.

Weird, huh? An unknown error. Imagine.

In searching the forums, I found that this is a common problem on Acrobat for Windows, but didn't find any hits for Acrobat for Mac.

I get a similar message when trying to open the PDF file in either Acrobat or Photoshop. It does display just fine in Preview.

Any ideas of what to do?