Interesting 1.0 error I manage to get when copying and pasting a large chunk of text from another site into the Rich Text Editor and then clicking on 'Publish':
Stack overflow at line:500
Initially turning posting works with rich text, then after a paste it doesn't, then turning off rich text works but if you turn back on rich text it's still stuffed... very odd!
Try it with yours - I'm copying the body text (the entire article) from here .
Any thoughts?