> Thanks a lot Vlad for quick response.
> 
> Sorry for missing information.
> 
> fbclient version is 2.1.1.17910 in Windows 2k3 Service Pack 2 x86 processor.

    2.1.4 was released a while ago and 2.1.5 is expected soon. Even if there 
was some
bug in old 2.1.1 - it is impossible to fix it there.
 
> Also i am using SQLAPI library to connect to Firebird. 

    I don't know this library, sorry

> If possible, can you
> please elaborate "manually serialize calls within same connection"

    If your application is multythreaded you should obey two simple rules 
working
with Firebird client before v2.5 :

a) don't call attach\detach from few threads simultaneously, and

b) don't use the same connection from few threads simultaneously

    Also, if you using Firebird events, you should not query database from 
events handler callback.

Regards,
Vlad

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