Hi, No I go to HTML mode, add the code, save it. In Visual mode I don't see the code at all, but when I go back to HTML mode it has added the CDATA stuff. I visited the link and implemented the code, but I think that is possibly for when users post on pages? What page do I need to update for when I add posts in the admin area?
I'm not sure exactly. The suggested fix involves editing post-template.php which should address the issue. You could create a custom post-template file and use that instead for each post and this way avoid editing the default file. In either case, I think you'll need to do some research to figure out the best way to modify the files to get what you want.
This is probably one of the auto thingies Wordpress does - like add paragraph tags when you don't want it to. one of the fixes for that [wordpress.org] (there are many,) but doubt it will help this particular issue. Maybe search for a plugin that removes it. I found one that might do it: TextControl [wordpress.org].