Saving powerpoint as PDF loses image transparency (solved)

When you save a powerpoint as PDF, transparent parts of images (e.g. png) appear as black regions in the PDF.
The solution?

1. When in the Save as... diaglog you select Browse, an explorer window pops up
2. Choose Save as type: PDF (*.pdf)  
3. An Options... button appears. Click this button.
   
4.  At the bottom of the window uncheck PDF/A compliant

Your preference will be saved with the document, so next time you don't have to go through this again.