Hello @BBLaser,
Thanks for writing in! I have logged in and tested a few of your pages. I can edit the About page in Cornerstone with no issue.
I did found out that your homepage is having the issue. The problem is that the homepage has been edited outside of Cornerstone some years ago. This has corrupted the cornerstone data which is why if you edit back in Cornerstone, it is now displaying a blank canvas even if the cornerstone formatting contents are still present.
Please see the secure notes
Since the cornerstone data is corrupted, it is best that you recreate the page from scratch.
Best Regards.