First I have to inform you, that I already solve my problem. This problem was with the database collation. username field in the vb_user table has been set to latin2_czech_cs. I changed it to utf8_general_ci and problem is fixed. I think that this is a vB bug, because this shorting should work with every collation... What do you think?
Another question:
My DB contain latin2_czech_cs and latin1_general_ci collation as well. It's a problem that I have both collation on different tables?
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