Can this problem with the Zebra indexing be caused by the 2 errors show in the Administrator Panel of the MARC record?
No, it can't be that. I've just tried to do an English UNIMARC installation: it works. So there is something weird in your installation. Are you sure you haven't for example done a MARC21 installation and then switched to UNIMARC via Koha system preferences? In this case, your koha-conf.xml file points to MARC21 Zebra configuration files, and your Koha instance send to Zebra UNIMARC records. You can see if it is the case in this config file: etc/zebra/zebra-biblios.cfg in parameter profilePath. In any case, I recommend you to redo a complete installation from scratch. Kind regards, -- Frédéric DEMIANS http://www.tamil.fr/u/fdemians.html