FLE4 commenting getting stuck?

If, when you try to post a comment to a FLE4 KB discussion and it goes to a blank page and the web address of that page ends in: .../wp-comments-post.php then there is something to check, your site setup.

1. Go to your dashboard and in the Super Admin section click on 'Sites'.
2. Hover over the site that's not working and click on 'Edit'.
3. Make sure that "Path" is correct, for example: /wpblogs/teachers/
4. Make sure that "Siteurl" is correct, for example: http://x.x.k12.mn.us/wpblogs/teachers/ (I substituted the "x's").
5. QED (but why did it take me so long to fix it!!!)