Chart Gradient Backgrounds Appear Gray in Internet Explorer
In Report Studio, you can define a custom palette
for a chart that includes a gradient. When the chart is rendered in
HTML format in Microsoft Internet
Explorer, the chart background appears gray. This is an Internet Explorer
issue.
To avoid this problem, select the chart and define the color white as the chart background.
For more information, see the Microsoft Knowledge Base article # 294714 at http://support.microsoft.com.