[Koha] intranet library set incorrectly

Hi there I am using Koha 3.0.06, Debian Lenny. My organisation has two libraries, University Library and Children's Library. Can anyone suggest why, when I log into the intranet as a staff member, the library set in the top right corner of the screen is always the Children's Library? The staff members all have their home library set to University Library. Thanks, Catherine