I am using Sitemap Generator for WordPress 3.0b6 and WordPress 2.1.2.
When I rebuild the sitemap manually (the 5th bullet in the Status box - If you changed something on your server or blog...), the Options-Sitemap tab will go completely blank. The WordPress Admin headers are still there, e.g., Dashboard, Write, Manage, etc.
If I click on the Sitemap tab to refresh, the normal screen will redraw with all the correct info.
Anyone else seen this behavior?