I have been having trouble with SBS 7.4.2 not sorting ÅÄÖ correctly, last (see https://bugs.slimdevices.com/show_bug.cgi?id=13600 ). A change of language in SBS between Swedish and English and back now finally fixed the issue in the web UI. In iPeng, the
navigation bar to the right in the artist and album lists is, however, still not showing ÅÄÖ but the artists are sorted correctly also on iPeng...