pg_restore and drop table problems

Hi again,

Version: 7.4.7-6sarge3
Structure of database: table A (id_a primary key) <-> table B (id_a,id_c
- foreign keys from table A and table C) <-> table C (id_c primary key).
Table A, table B and table C have one record for test purposes

Problem: After error on pg_restore can't drop table that gave error!

Steps to reproduce:
1. pg_dump with -Fc option from database
2. A column name on table C is changed
3. pg_restore using option -S and --disable-triggers with error
identifying that a column on table C was changed
4. drop table B. Can't drop table giving ERROR: relation "B" has
reltriggers = 0

What could be happening here?

Best regards,
Luís Sousa