Problems viewing PowerPoint (mac) presentations containing Prism graphs on an iPad.

Prism Mac can send graphs directly to PowerPoint using the Send button on the toolbar. Or you can copy a graph from Prism and paste into PowerPoint. 

When you use the Send button to send to powerpoint, Prism sends a pdf, which is the standard for graphic interchange on the mac. If you copy to the clipboard, Prism puts a pdf on the clipboard and osx also converts to a bitmap picture which is also placed on the clipboard. When you paste, the pasting application chooses which it wants. PowerPoint 2011 chooses the pdf. PowerPoint 2009 chose the bitmap (for no apparent reason). You can use Edit..Paste Special to choose.

The pdf format is usually the best choice, as it is both more compact and gives sharper graphs (since it encodes vectors and fonts). The picture format is just a bitmap, so tends to be a bit fuzzy, especially if you change it size. 

If you try to view the PowerPoint file (either .PPT or .PPTX) on an iPad (I used IOS version 4.3.1), Prism graphs pasted (or sent) as pdfs appear empty (except for the graph title). Opening the PowerPoint file within Keynote on the iPad (instead of the built-in PowerPoint viewer) doesn't help. The graphs still appear empty.

Workarounds:

• Paste to PowerPoint as a bitmap Picture. Those view fine on the iPad.
• Export the graphs as a pdf file from Prism (using the Export button). You can first select a set of graphs, and export them all into one file.  PDFs exported from Prism can be viewed with no problem on an iPad.
• Open the PowerPoint file using Keynote on your mac, and save the keynote file. That views fine on the iPad. (Or just use Keynote, rather than PowerPoint, to make the slides.)