I also suffered a blank sitemap, although the plugin’s sitemap generating feature worked before I converted my site to SSL. So I turned off the Dynamically Generate Sitemap option and the plugin began generating useable sitemaps again. The script that dynamically generates a sitemap when the site is visited by a search engine was apparently unable to run after the SSL conversion. This means my sitemap is now a static file that needs to be updated when I make new posts to my blog. It’s not much of a problem, just takes one click of a button.
