The Careers site has "Serbia and Montenegro" instead of separate entries for "Serbia" and "Montenegro".
Thanks for the report!
Shinhan's problem is with our Country Dropdown list on the profile page. We were filling it with countries that should've matched an ISO Spec. The spec that governs country codes is ISO 3166 which has multiple revisions. The revision we seemed to be working off of had "Serbia and Montenegro - CS" marked as an acceptable country in a transitional state since September 2006. Followers of the spec would be were allowed to use it for 5 years since the start of the transitional period which would have ended September 2011. So our dropdown has been out of spec for 6 months. BOO US and our non spec following ways.
This is now fixed.