"The text in a graph may appear jagged and less defined if you apply a custom animation to a Microsoft Graph chart object in a Microsoft Office PowerPoint 2003 slide show. The affected text includes the axis text, the legend text, and other text labels.
This problem occurs because PowerPoint 2003 converts the various graph elements to screen-resolution bitmaps. Therefore, PowerPoint 2003 can independently animate the graph elements during a slide show. If the graph elements are converted without a background color applied to them, the text appears jagged."