Some old-school weirdness here.
1. I made sure the updated DA Library.php was correct - no effect.
2. I turned on the error reporting in 2 pages - one UPDATE page and one INSERT page.
3. Tested and BANG, the UPDATE page redirects correctly with no errors. 'A cache issue' I think, and I switch browsers to validate... all goes well.
4. Now I test the INSERT page, with the error reporting code snippet, but it does not redirect to to the value in $WA_redirectURL = "index.php", it just re opens itself.
I am now going over the INSERT page. No errors are reported but there must be a coding issue.