I've been watching the sitemap generator on my dedicated Linux/Apache server for 3 days now.... It seems to be crawling pages that do not exist... I suspect I've either mis-configured the tool - or there is a bug... It has crawled, so far, 90,000 pages - but I know I only have around 45,000 pages.... The problem seems to be with my URL structure where page numbers are involved... i.e. "../pageXX,htm"
I can PM you the URL if there is anyone reading this.... thanks.