Can only access password change or System page in incognito mode

[puterboy]

I just flashed a new  KC868_A16 board with the latest KCS  v2.2.10 firmware.
I was able to login and change my password the first time via my Chrome browser.

But now I can no longer change the password or even access the "System" tab (all the other tabs seem to work fine)
Specifically, every time I click on either "Admin->Change Password" or on the "System" tab, I get redirected to the "login.html" page and re-prompted for my (current) Login & Password. After successfully logging in (again),  I get re-directed to the "index.html" page.

This happens repeatedly... meaning that I can't change my password or access the System page.
I tried enabling pop-ups, clearing cache, deleting cookies, allowing "insecure" sites, disabling Ad Blocker, etc. but none of this helped.

However if I use "Incognito" mode in Chrome then everything works!!!!

When I use MS Edge, I can't log in *at all* in normal mode -- it just re-displays the login page with blank entries and NO incorrect password pop-up, so presumably it is recognizing my password.
Again, if I use an "InPrivate" window, it all works fine.

[admin]

can you use another web browser for a test.
or you can clear your web browser cache or cookie.

[puterboy]

As I mentioned, I tried both Chrome and MS Edge - both worked fine in private/incognito mode but failed to various degrees when in "normal" mode. See original post for details.

Clearing the cache on MS Edge, resolved the problem... until I closed and reopened the browser.

The problems seems to be:
1. If no cache saved (e.g., private/incognito mode) then works fine
2. If cache saved (e.g. normal mode) then it works once and then fails when reopened unless you clear cache (each time)