[Koha] Koha 3.0 and UTF-8 ???

I followed the instructions on http://wiki.koha.org/doku.php?id=koha_3_install_guide_ubuntu_hardy and installed Koha 3 on Ubuntu 8.04. I did everything as on the page and I set UTF-8 where expected. Selected MARC21. Installation was OK. I added my Z39.50 server and searched for a ISBN (9789197658843) but it came back with the non ASCII characters as a question mark in a black square... I imported it anyway and tried to save it but got this error: ------------ Can't save this record because the following field aren't filled * tag 942 subfield c item type in tab 9 ------------ I start to believe that Koha can't handle anything but ASCII. Someone, please prove me wrong.