pg_restore error

I've just got the following message while trying to restore a database :

pg_restore : [custom archiver] Dumping a specific TOC data block out of order is
not supported without ID on this input stream (fseek required).

The command was :
pg_restore -L /tmp/toc --dbname=whitebeam --disable-triggers --username=postgres
/var/backups/restore-db.psql

/tmp/toc is a re-orderd output from :

pg_restore -l -a /var/backups/restore-db.psql > /tmp/toc

Using Postgres 8.1.4 on
Linux version 2.6.15-1.2054_FC5

The dump itself was made on another machine running 8.1.4 on Fedora core 4.

I've run similar commands on this machine before with no problems. Not sure why
I should start to have these problems now?

Anyone else seen anything similar? Thoughts much appreciated!

Pete