[Koha] linking authorities to biblios

[Haik Zargaryan]

Dear friends,

We have recently upgraded to koha 3.10. After importing our catalog and authority records we have used link_bibs_to_authorities.pl script to link them. During the process I was frequently (once per 1000 record) seeing this error on the console.
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Auth error: Query term includes characters that do not translate into the target character set (1072)  Bib-1
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However, when the process is over it seems that authorities were linked to the biblios. The message below appears in the console.
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Bib authority heading linking report
=======================================================
Linker module:                          C4::Linker::Default
Run started at:                         02/04/13 10:40:18
Run ended at:                           02/04/13 11:16:16
Total run time:                         2157486 ms
Number of bibs checked:                 255350
Number of bibs modified:                0
Number of bibs with errors:             0
Number of headings linked:              44199
Number of headings unlinked:            722664
Number of headings fuzzily linked:      0
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Moreover, when i go to specific records in the sub field 100 $9 I can see the appropriate authority code. Yet, when I search for the authority in the *Used in* column *0 records* is written. 

What is more, I was told that starting from this version we can search for the records using the *authority 400 a$* field instead of the author name just preliminary turning on syspref "IncludeSeeFromInSearches". Unfortunately, this feature worked neither. 

Any ideas or suggestions? 

Thanks in advance,
Haik