I'm having a problem optimizing a PDF in Acrobat (9.4.5). I first created a PDF from within PowerPoint (Office for Mac). When I optimize the PDF in Acrobat, I consistently receive a "conversion warning" message stating the an "error was encountered while processing images." I don't have a problem saving PDFs from programs such as InDesign or Illustrator. I tried converting the ppt to an earlier version but receive the same warning in Acrobat.
Any ideas how to fix this? I have a lot of .ppt files to convert into PDF. Thanks.