> With JayBird 2.1.0 it produces an empty result when there
> should be matches,

Can you please do the following:

a) create a bug report in our tracker;
b) create a small test case that uses Hibernate and Jaybird 2.1.0 which
produces incorrect results and send it to me?

> and with JayBird 2.0.1 just throws a DataTruncation exception:

This is ok, since we have fixed it only in 2.1.0.

Roman