In the Sneak Preview SP 15 is something missing in the IGS installation:
<b>Problem:</b> if you try to call an IGS-Chart the typical "Graphics Rendering Problem" occurs
(even after inserting the correct IGSUrl http://HOSTNAME:40080 with the Visual Administrator).
<b>Solution:</b> the config files for the chart types are named wrong !
Go to the dirctory C:\usr\sap\J2E\JC00\igs\conf\ and rename the files gfwchart.tpl to gfwchart
and xmlchart.tpl to xmlchart (without extension !).
Then the IGS Problem should be solved.