BUG #5009: Loss of information

The following bug has been logged online:

Bug reference:      5009
Logged by:          Fernando Velloso Tanure
Email address:      f_tanure@terra.com.br
PostgreSQL version: 8.1.11
Operating system:   CentOS5.3 Red Hat Enterprise Linux RHEL
Description:        Loss of information
Details:

Good afternoon

I'm having problem in postgres where some rows inserted or changed during
the day was lost as a rollback was executed.
I am using a system developed in Delphi with Zeos components for access to
the database.
The sequences used in the inserts are not lost.