I go to insert a picture/image from my files and I get a message on the slide (in the image box) that says "The picture cannot be displayed". It is a pdf image. I created the file on one day and inserted images just fine. I saved the file to finish later and when I came back the next day I found I could not insert any picture files. What gives?
I am relatively new to Powerpoint and I am unable to locate any helps that would get me past this. Whatever assistance anyone can provide would be helpful.

thanks.