pg 8.3 replication causing corruption

Should replication cause corruption on the secondary when stopping/starting
the primary? (pg 8.3.12, windows 2008 R2 on both servers)

Everything seems to work OK, but when we trigger the replication server, it
doesn’t pass a reindex. (Errors with can’t create unique indexes due to
duplicate values.)

I detailed the logs in another post (link below), but fear my verbosity may
have scared people off! :)

http://archives.postgresql.org/pgsql-general/2011-10/msg00121.php

Right now, our only solution seems to be to do another pg_start_backup() -*>
copy -> pg_stop*_backup() after each nightly backup.

I'm doing something wrong.... Thanks for any help/pointers!

*-Bob Hatfield*