Notice: Undefined variable: site_name in include()

There are some repeating notices generated in packs by 4 when anonymous user comes:

Notice: Undefined variable: logo in include() (line 170 of [...]\Htdocs\new\sites\all\themes\mayo\templates\page.tpl.php).

Notice: Undefined variable: site_name in include() (line 178 of [...]\Htdocs\new\sites\all\themes\mayo\templates\page.tpl.php).

Notice: Undefined variable: site_name in include() (line 180 of [...]\Htdocs\new\sites\all\themes\mayo\templates\page.tpl.php).

Notice: Undefined variable: head_title in include() (line 49 of [...]\Htdocs\new\sites\all\themes\mayo\templates\html.tpl.php).

Location: http://site.com/new/user/login (for all notices)

Additionally, when admin logged in, the site name and slogan are shown. When any user logged out, the site name is gone.

Configuration: I set access to content only to authorized users in permissions section of site options (because it is a test site for now). When anonymous tries to view content, system transfers him to the login page (see "Location:" above).

The notices has appeared only after installing Mayo theme. Standard theme did not generated any.

The platform is Windows Server, the site name is set, and logo disabled by the checkbox in options but no files were deleted from filesystem (and not modified).