was indexed fine until about a year ago.

The only thing I can think of is that search engines throw up at using h5 before h4, or that some person (fantasizing now) has reported my site as unsafe to every search engine.

However, I'm not here to speculate. The site validates, and has an RSS feed on the front page, for Pat Morita's sake! To me, it looks like the kind of site search engines would feast on. It's got more than a dozen blogs on it, if nothing else. Hah. :)

I was thinking you could identify basically what has changed in search engines (currently, google, yahoo, bing which used to work fine) the last year to make them not find news and blog articles on this site. The site was submitted to Google, oh, way back in 2006.

With online crawler tests I get mixed results, some crawlers index fine, some go blank. I don't really know which ones are reliable and am looking to you guys for advice on that.

Yes, I am prepared to again verify my site with Google and upload a sitemap, but that's not the topic here. I really would first like to know what change on the site last year could make search engines not index it. (Yees, the robots.txt is fine. Should be nothing to discourage bots there.)

It's a very intriguing problem. One which I have yet to find the reason for but would like to know the reason for. Any and all input appreciated, but I would heavily enjoy pertinent advice the most. ;)

Edit:

Some google searches that don't show up include -

aca630

All of which are posted in the news and blogs that are on the front page there.

Now, these search terms are extremely specific as the term in is almost unique on the web and ACA630 is also a very qualified search term that can't be confused with mainstream search terms.