Well, I have both regular and image sitemaps loaded, and Google has acknowledged both with their green checkmark. However, in the "format" column, the xml site map shows "sitemap" but the image sitemap just has "--" as if the format is unrecognized.
The format of the image sitemap appears to follow the example Google gives in their webmaster guidelines, so I don't understand why this happened. I followed all your instructions, Thomas.
In addition, neither of those sitemaps shows any urls indexed. Zero. This has never happened before. Since I began submitting sitemaps, I've always had over 900 urls indexed. Now I have none. What does that mean, if anything? I'm worried.
sitemap urls
http://www.cirrusimage.com/sitemap/sitemap.xml and sitemap-image.xml