Problem with some databases in MySQL Delphi 6 support

Hi all!

    I am using Delphi 6 professional and when I try to use TSQLQuery with a
MySQL TSQLConnection, Delphi says me with an error window:
    "Error: Access violation at address 04478774 in module 'DBEXPMYS.DLL'.
Read of address 65696C63"

This happen when I try to select a new table in my database. If I open older
databases (like for example the one named 'mysql' (owned by the server)),
everything goes very well... :(

What Im forgetting????

Kisses for the kids ;)