I like WP-Codebox.
If I enter code between "<pre lang="rsplus"> and ", and then publish the page or post, I get the expected the results....at first.
However, as soon as I edit the post or page and then publish, I see that large chunks of code are being wiped out or dropped. I am then forced to update all the code blocks again. Clearly, this is not viable for long pages or continued use.
Why is this happening? What can I do to stop this?