Just installed fresh Kolab 16. In Calendar section "Calendar" folder name is barely readable. See screen shot:
If I click on "Birthdays" and then "Calendar" again - Calendar folder name is in white letters and is readable now:
Something similar is happening in Files section - Files folder name is barely readable
rpm -qa | grep roundcube | grep skin roundcubemail-plugin-acl-skin-larry-assets-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-libkolab-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-skin-enterprise-core-0.3.8-1.1.el7.kolab_16.noarch roundcubemail-plugin-libkolab-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-jqueryui-skin-larry-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-kolab_delegation-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-tasklist-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-kolab_tags-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-kolab_notes-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-kolab_files-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-skin-larry-assets-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-jqueryui-skin-larry-assets-1.4-66.1.el7.kolab_16.noarch roundcubemail-skin-enterprise-assets-0.3.8-1.1.el7.kolab_16.noarch roundcubemail-plugin-kolab_activesync-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-kolab_notes-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-kolab_addressbook-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-skin-elastic-assets-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-kolab_tags-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-kolab_delegation-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-tasklist-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-skin-kolab-0.4-16.2.el7.kolab_16.noarch roundcubemail-skin-larry-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-kolab_activesync-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-managesieve-skin-larry-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-zipdownload-skin-larry-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-libcalendaring-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-skin-enterprise-0.3.8-1.1.el7.kolab_16.noarch roundcubemail-plugin-managesieve-skin-larry-assets-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-zipdownload-skin-larry-assets-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-calendar-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-kolab_files-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-libcalendaring-skin-larry-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-libkolab-skin-elastic-assets-3.4-47.2.el7.kolab_16.noarch roundcubemail-skin-elastic-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-libkolab-skin-elastic-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-calendar-skin-larry-3.4-47.2.el7.kolab_16.noarch roundcubemail-plugin-acl-skin-larry-1.4-66.1.el7.kolab_16.noarch roundcubemail-plugin-kolab_addressbook-skin-larry-3.4-47.2.el7.kolab_16.noarch
OS - Centos7