> regarding the Firebird dialect now shipping with Hibernate (3.1), do
> you know if it has problems with Firebird 2?

See http://jaybirdwiki.firebirdsql.org/jaybird/doku.php?id=tip:hibernate

I have created my own dialect, but the only reason for it was to limit the
PK size for automatically generated columns so the test suite passes.

> I sometimes have strange quesry errors often given by mapping errors but
> sometimes they are a bit misterious....

Well... then if you're able to reproduce them, all we will be glad to check
it - core devs to see if Firebird is ok, me - to see if Jaybird is ok.
Anyway, please post your stack traces, maybe it will bring some information.

Roman