Yup I'm familiar with what 404 is. My first thought was the site was glitching or timed out (neither was the case even with simple cut and paste). As stated it turned out the post was too long and had to be cut up into pieces (even had to re-cut one section after to get it to work). Looks like there's an undisclosed character max (usually done with a max/current character count at the bottom of the window) Anyway got it posted, problem solved. Thanks.wayne49 said:HTTP 404 is a resource not found.
I suspect by your comment, that you took too long to compose the post, and the "resource" timed out, then when you hit POST, the server's link to the temporary post was dead and gone, resulting in 404.
Solution: to compose a lengthy post, if you must, do it offline in a notepad editor, then paste into the browser, review, then hit POST.