I've been using ATW to check on link count for a site and today it came up "no entries for..." The number of links, etc showed up and when I check for pages the usual number came up except for the main page (index.htm). Any thoughts on why and what action to take?
Matkat, an index page go missing seems like a perpetual problem with ATW. I have no good idea why that is happening in some cases, but reports have been made here frequently. It does however not seem to be any penalty but rather a technical thing. From what I have seen so far the pages usually reappear in time. You might want to give it some time. Else I would contact ATW through their webmaster contact channels on their site, they have been known for excellent response.