Hey there, I have the same problem; an empty configuration page. Funny thing is, I have no other Plug-in running. I’m running WP 2.8.6.
I examined the source code an found, that the output was interuppted as you can see:
<div id="wpbody-content">
<div id="screen-meta">
<div id="contextual-help-wrap" class="hidden">
<h5>Hilfe zu “XML-Sitemap Generator”</h5><div class="metabox-prefs"><a href="…">Plugin Homepage</a><br /><a href="…">Sitemap FAQ</a></div>
<h5>Weitere Hilfe</h5><div class="metabox-prefs"><a href="…" target="_blank">Dokumentation</a> (<a href="…" target="_blank">en</a>)<br /><a href="…" target="_blank">WordPress Support-Foren</a> (<a href="…" target="_blank">en</a>)</div>
</div>
I’m willing to help, but I don’t know how to access the server logs (it might not be possible).