Zina

After we have added code block to our pages we can't any longer add content to the page. The block icon is displayed - but when I try to drag text block (or any other block) to the page - nothing happens. Also on some pages where text block already existed - we are trying to style contents of this block, the editing panel appears, but the moment I click on it, it disappears. I can add a new blank section to those pages, but I can't add block within this new section either. Any advice will be appreciated.