>> Now I'm using only the 2 native library I found in repository jaybird22.dll& jaybird22.dll.
>
> jaybird22.dll should work. I will check clean checkout, but please check
> your classpath for the right driver version.

Issue confirmed, must be something changed in the meantime... will look
into it soon - I migrated to Windows 7 and do not have Visual Studion
installed yet.

So, porting changes in HEAD (file
client-java/src/main/org/firebirdsql/gds/impl/jni/BaseGDSImpl.java, diff
between versions 1.12.2.1 and 1.16) looks more easy solution in your
case. Please let me know if you need any assistance with the task.

Ah, in order to get sources of Jaybird 2.1.6, please do checkout with a
tag "Jaybird_2_1_6" (without quotes).

Roman