Upgrade from 1.51 to 1.54, Admin Works OK but store does NOT

[cvhainb]

thank you.

What I do:
1) Disable URI Mapping
2) Backup .htaccess and remove .htaccess

The result is same, no luck. admin login redirected to https while site login did NOT.

BTW how about the ajax.php and /ajax.php?act=ajaxPayment&method=setNoscriptCookie? Are they normal for 1.54?

I have tried to create an account on your site and login. It works fine for me. Please try to create a new account then login with yourself.