NR2400

Resolved: (okay, we all have to learn)
From the readme.file in the plugin:
Q: “I’m not able to save my custom post type because the page keeps telling me ‘That post type name already exists.'”
A: “This a jQuery ‘bug’ that only sems to plauge a few. I’ve noticed that this validation standstill will occur if you have any text printed outside the ‘<body’> element on your page. If that’s not the case and the problem still lingers after you’ve upgraded to version 1.1, you can dequeue the validation script by placing the following code in your functions.php file.

I will not copy the code as my issue was that I have a child-theme that contained a newline ?> php-ending in functions.php. Removing this whitespace seams to do the trick.

Now I’ll go back to configuring this great plugin, thanks Rachel.