Dear Vlad,
the shortcode issue has not been reported before, and it’s hard to emulate on another machine since it is inside the admin area; I’m going to send you the latest version of the shortcodes folder to update, can I send it to the email you used while registering on this forum?
Regarding the second question – please add this code to the “style.css” file (“Appearance -> Editor”):
.home #nav-secondary li.current-menu-item a { background-color: inherit !important; }
and do not forget to hit “Update File” ;)
Sincerely,
Andrew | Satori