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My gut feeling is either you still have some nasties left over from your last hack, or someone complained when it was hacked, followed by someone at Google deciding to block your sites.This could be true but then Google is really lacking in the follow-up department! 6 months had passed between the break-in/fix and de-indexing. Still, I have sites that have been de-indexed yet never hacked into (located on a different server).
regarding Panda being tasked with de-indexing of sites
Has anyone with a Panda devalued site noticed previously indexed pages being completely de-indexed?In my case I can see a small but noticeable 15-20% drop in the amount of search queries shown in WMT for each of the banned sites approx. two weeks before the ban. The date does not jive with the official Panda schedule though - the drop happened on Aug 4th, the ban - Aug 21st.
is that all well written content?It's a forum. Some content is good, some is rubbish. Utter spam and obscenities are normally deleted. Some tiny amount may still be there. Nothing different from any other forum you've seen out there. Maybe not as tightly moderated as WebmasterWorld but cleaner than many that are still indexed.
but Gbot not getting a full load on a page request would explain removalDo you mean as in an incomplete html, i.e. no closing body and html tags got Gbot but full page with some sneaky JS on the bottom to actual users? I guess can see how this could have been abused