We're doing our own bug hunting session. We found a bug in the addbiblio.pl, this bug appears only in fields with authorized values lists. When you click in the + sign to duplicate a field it duplicates AND FILLS with the same value the field. What's more if yu have an empty subfield with the same authorized value list it also does the same behaviour. Since we have been hacking koha, I thougth that was something we broke, but I've found the same behaviour on the demo site of koha france. We tested this with the 041 field (language) y think that in koha france in 106 or something like that (know very little UNIMARC). We've doing all kind of tests and found that this bugs is related to the scrolling_list method of the CGI library, this somewhat caches previous calls to the function. Any help will be appreciated Andres