Thank you for providing the URL and login to the website. I went to the website and there is no problem using the Cornerstone for posts and I even added an exclamation point to the end of the latest post to make sure that it saves correctly.
So having said that, the second question I guess is about this:
Please consider that the option you referred to is a Macro, it is an automatic system to set all the below options in a certain way. You just simply can ignore that option and set things manually below which you already did and enabled the Cornerstone for the posts for example.
I suggest that you read more about the options here in our changelog: