Can't make backup

Hi,
We are running PostgreSQL 8.2.5 on amd64-portbld-freebsd6.2. We have 2 databases, one is a small one (and the pg_dump works ok) and the other one with 14,553,106 rows (the larget table has 3,700,000 rows).
Every day we run a Windows Programmed pg_dump, it used to work fine with PostgreSQL 8.0, but since we installed the new version we are not able to make a backup. We tried to make a whole database backup and it never ends. We tried to backup table by table and it reachs a table of 50,000 rows and it keeps for hours in that table, we started it again and pg_dump backups that same table in seconds, but it stops in another different table.
If we watch the server message.# we don't have any error, it's like some tables were locked and pg_dump would keep waiting for the table to be unlocked.

Do we need to configure the server to be able to make a backup as we used to do it with 8.0 version?

Thanks.
Sebastián

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