On Perch 3.0.11, I try and save a 'code block' region using Perch CMS and I get an error 403. In earlier perch versions it worked.
The problem seems to be the inclusion of a script. I have generated the error simply by including <script></script>. Other html, divs, ul, li, a, img are OK. As soon as it sees a script... 403!
By the way why does the code block template need editor="markitup"? Seems weird!