The Google Sitemap, nor the robots.txt excluded posts features seem to be working in 1.4. The Google Sitemap is blank and Google Webmasters Tools reports a parsing error:
XML Parsing Error: undefined entity
Line Number 4, Column 127543:<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:image="http://www.google.
Checking the plugin's robots.txt box has no effect on the output of the robots.txt
I have tried saving a post as well as deactivating / reactivating the plugin, saving the sitemaps manually. Using WP 3.5, upgraded from 1.3.3
The php errors in 1.3.3 are fixed.
Retrograded back to 1.3.3 for now, everything works as before.