Error message when trying to convert powerpoint presentation to Adobe Acrobat PDF

When trying to create an Adobe Acrobat PDF file from Powerpoint (save as Adobe PDF from the Print menu), Automator gives the following error message: "an error occurred while saving the PDF file". Currently using version 14.4.6 of Microsoft Powerpoint for Mac, 11.0.09 Adobe Acrobat and OS X Yosemite 10.10.1 on iMac. Also had the same problem previously with Mavericks and Mountain Lion. The problem seems to be the Apple Automator not working correctly with the Acrobat interface. I create Acrobat PDF docs perfectly well on my MacBook Pro (OS X 10.7.5) and am scared to update to the latest version of OS X in case that also affects the ability to create PDFs.

I have tried using Apple's own PDF creator, and doing this by first creating PS files then converting to PDF, however, many bugs appear in the files, and they are enormous - around 5x the size of Acrobat PDFs, so this is not an option. I have also tried troubleshooting with Adobe to no avail.

Can anyone help?

Thanks,

Jane