friendly url Friendly URL stopped working for login page

[Flash951]

Friendly URL stopped working for login page.

"Moved" Prestashop in Apache config from www.kunnskap.no/butikk/ to www.kunnskap.no

Turned Friendly URL off and on to recompile .htaccess.

Friendly URL for login page is not working. Before moving Prestashop from www.kunnskap.no/butikk to www.kunnskap.no, it worked perfectly.
Moved shop in Apache config/root directory for domain name, installation still in "domain name/butikk/ directory.

Everything else still works perfectly with friendly URL, only URL for login page is not working.

Internal Server Error: 
https://www.kunnskap.no/login?back=my-account

When turning Friendly URL off, everything works fine.

Appreciate help.