I believe I’m experiencing the same issue.
I’ll click the “update” button and the page reloads to “/post.php” page with no change to the page/product I’m editing.
I hover over the “Update” button and see the link populate at the bottom of my browser for the “/post.php” page.
I know this problem can easily be resolved by the WP-Gurus as long as their update button wasn’t updated (please don’t penalize me for the poor humor).