Fatal discussion post error depending on content:"spam filter that is installed on this site is currently not available" :KEJNLA

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KEJN0X: I'm trying to post an update & addition to a discussion via http://groups.drupal.org/node/18329/edit but, in pressing preview, it's causing the seemingly-fatal error quote[The spam filter that is installed on this site is currently not available. Per the site's policy, we are unable to accept new submissions until that problem is resolved. Please try resubmitting the form in a couple minutes.]; if I remove one of the tables in the content (specifically the new table labeled KEJ440), AND if I remove everything but this table, the error goes away & I can preview fine. But I need the whole thing.

KEK8DD: By this error message, this is a bug with the Drupal of Groups.Drupal.Org. And in particular my guess is something about the post is making that Drupal wonder if it be spam, which is perfectly fine except that, when the Drupal then goes to invoke a spam filter to check, that spam filter isn't available (perhaps not installed), causing this error message. In which case,
KEKI2M: *the best work around would be to fix the spam filter so it works, and in the meantime lower the standards for this spam check so I & others can continue work.
KEKI2V: *And then it would seem the problem is because someone/something has decided to get "clever" and (further poorly!) filter user's input HTML (this time for spam). Please just use a good periodic CAPTCHA --simple & reliable.

KEJNJY: On searching, I found nothing matching this exact kind of problem, so I posted this new discussion. Specifically I did a search for the error via http://groups.drupal.org/search/node/%22spam+filter+that+is+installed%22 but the posts I seem find are either a bit old and say "if it thinks it's spam, you'll get a CAPTCHA" (as http://groups.drupal.org/node/8973 ) or say "just try later" and that works. But this is NOT seemingly a "try later" situation -- it depends on the node content. (2nd, I just verified - same error 7 hours later.)
KEJNS9: I will continue to try to diagnose what of the node content is causing this (I've already checked and it IS well-formed XHTML). But that may take some time. So,
KEJNT7: In the meantime, someone know about this? For instance,
KEJNU5: *could it be a maximum size limit (which is then giving this spurious error message)? As what is the maximum size a node can be? (the current version is about 61KB and post fine; the new version is about 91KB and gives this preview error)
Thanks!