I'm using IIS 6 andhave .NET 3.5 SP1 installed. I can see the image on the filesystem and it is blank [white]. Sniffing the HTTP conversation I am receiving 200 back for /ChartImg.axd. This is the definition in my aspx.
<
asp:Chart ID="Chart1" runat="server" ImageStorageMode="UseHttpHandler">
<Series>
<asp:Series Name="Default"></asp:Series>
</Series>
<ChartAreas>
<asp:ChartArea Name="TestArea"></asp:ChartArea>
</ChartAreas>
</asp:Chart>