Linking domain dropped followed by significant decrease in Domain Authority

[kwoolf]

A relatively high ranking site disappeared from the linking root domains of a client site, and the site dropped significantly in domain rank, authority, and trust.

Oddly enough, traffic is almost double the previous week, and search results for keywords remain strong. I checked OSE and the linking domain is not listed. There are also several other linking root domains that have never shown in the domain analysis, but we'll leave those for a later topic.

I visited the linking root domain that disappeared from the analysis and found everything to be in order. The site is a major local forum with a relatively high domain authority. All links are still there, and there hasn't been any change to the site as far as links are treated according to the owner.

The only thing that has changed since the last site analysis is an event campaign ran with unpaid ads posted throughout the forum. The site being analyzed is a catering company that is cooperating with the forum owner and local bar to host a local celebratory event.

Of course I'll wait for the next indexing to see if things change, but what could be going on here? This is more of an SEOmoz question, as we're talking over 10 point deduction in domain authority, although search results are still strong.

[kwoolf]

I notice now that Google WMT shows a large number of unique linking domains. SEOmoz doesn't pick those up. I'm sure there is a disclaimer somewhere stating that indexing results will differ from search engines. Any way to fix this or tell SEOmoz where to look?

[RyanPurkey]

Did that site add "noindex" somewhere? It sounds like something that dramatic for it to leave the index suddenly like that. Maybe check robots.txt and other indexing issues.