I have a sitemap + images on [external links are visible to admins only]. It works fine when I ask a sitemap for 1000 pages, which I did to test. 1000 pages and 41000 images. However, when I tried the whole site (63500 pages and 125000 images), it did do nothing, even after 1,5 weeks (!!!) of running, even though I could not see if it actually did something.
As the 1000 page sitemap worked fine, it seems that the installation is OK. What to do ?