Comments working again ...
My apologies for all the readers that were eager to comment on a post but couldn’t because comments were broken. I fixed it and everything should be back to normal now – probably also Spam coming in a bit more frequently … bummer, I almost got used to “Zero Comment-Spam” :(
(For the technically inclined: The WP-Filters plugin seems to be the culprit … it wouldn’t work with the plethora of filters I currently use here at “taking the red pill”.)