Thanks for your advice
Apologies, I do not intend to write something untrue, just what I observed.
Trust your explanation/advice, so investigated a bit more and noted two things
1) I had some error in my browser, found that it kept page/log in after close, this was giving the inconsistent behavior, where I not always actively logged out (partly my idiotic fail-40 as I previously stated), anyway browser repaired/fixed/cleaned.
2) Found that the CB-reconfirm module itself is required to be Public as well, or at least by making this module public then it works,
(without login) using link, the page states that the e-mail change has already been confirmed, and this is actually done.
Once again thanks for your support and explanation, much appreciated
Looking forward to the bug fix for mail already in use.