V 2.1.0

While trying to figure out the issue reported here:
https://www.zen-cart.com/showthread....customers-list

I encountered this new issue.
After filling the credentials for admin access the page reloads to login again.

Some more details to clarify the situation.

Till yesterday I was able to access the admin.

I created a new admin with limited access profile (to test for the issue reported on the thread mentione above)

I asked the other user (limited admin) to try, and he encountered the issue reported here, after submit the page would reload to login page.

I set the configuration files to use SSL
Code:
define('ENABLE_SSL', 'true');
I noticed that the browser would report unsecure connection, site has SSL installed, to make sure I contacted the host, and they confirm the SSL is working for the site.

I then tried to login and encountered the issue of not being able to access with login page reloading.

I disabled SSL in the configuration files, and tried again, and issue is still recurring.

All the above is occuring in tesoreriabahai.org/zen-210
While the tesoreriabahai.org with Zencart v 1.58 works fine

Strangely I encountered the issue on tesoreriabahai.org as well after setting the SSL for the zen-210 install, after clearing the browser cache I could access the old version admin with no problem, but the new 210 is still not letting me access.