Thanks for the explanation, whooami. It’s working with mod_security off on post.php, so I’ll keep it turned on for the rest of it, at least for now.
I know that what I was posting would a challenge for any script attempting to parse it – I know it’d cause me a few nightmares, but come now, isn’t this what the code tags are meant for?
I thought they were meant to escape anything within the pasted code/output.
I still maintain that it’s an inevitability which WordPress doesn’t cope with, and gives a very ungraceful error – it is a bug. I won’t be the last person to try and paste in Cisco router output and when met with the same error (which doesn’t describe anything useful) I doubt I’ll be the last person to find it frustrating.