I have code that programmatically gets images and puts them into a PowerPoint 2007 file (using ImageEx, AddPictureFrame(), etc.). That works very well and as expected. However, there is one minor thing that's occurring and I can't figure out why. When we look at the resulting presentation file, all of the images that were added have a light red border around them. The original images do not so I don't know where they're coming from.
Any idea as to why this might be happening and what I can do to resolve it?