OK, thanks for your answers.
Perharps now I finnaly find and remove the problem.

--- In firebird-support@yahoogroups.com, Svein Erling Tysvær
<svein.erling.tysvaer@k...> wrote:

>
> Then I would expect the oldest active transaction to be one higher
> than the next transaction. Another thing you could do, is to try to
> rename the database file. If someone is accessing the file

(including

> you), you will be denied. Though I guess that means no connections,
> not only no transactions. Also, tools like IB_SQL (freeware,
> www.ibobjects.com) can show who is connected. It will at least show
> you as connected, since you must be connected to get that

information

> and it doesn't say anything about transactions (though if you didn't
> do any DML in IB_SQL and only find your connection, then you know

that

> there ain't no uncommitted transaction that is causing problems.
>
> Set
>