PowerPoint 2007 Will Not Close After Acrobat 8 Finishes Creating P

[Richard Mac]

When creating a PDF in Adobe Acrobat 8 Professional from a pptx file, the PDF
is created, but PowerPoint will not close.

From within Acrobat:

1. File | Create PDF | From File
2. Select a pptx file and Open
3. PowerPoint launches and the pptx file is opened
4. The PDF is created and appears int he Acrobat window
5. PowerPoint does not close.

I want PowerPoint to close. Is this a setting in PowerPoint (or Acrobat)?
has anyone else experienced this?

Thank you.