Similar issue. If I deactivate all plugins, it worked (I think). I have my site map built… but when I reactivate my other plugins, will this disable any of the sitemaps functionality… or will it hum right along in the background even though I can’t access the settings page w/o deactivating everything again?
I have:
Akismet
All in One SEO Pack
Audio player
Google XML Sitemaps
WordPress.com Stats
installed… which one is giving me the issues?