You can upgrade to Firebird 2.1.4 (I use this in production)

http://www.firebirdsql.org/download/snapshot_builds/win/2.1/

This has a lot of bugs fixed.
(
https://firebird.svn.sourceforge.net/svnroot/firebird/firebird/branches/B2_1_Release/ChangeLog
)

Regards


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