Delete oid giving problems

Hi all,
I am having problems deleting a record with oid. I tried
select lo_unlink(68778) from tablename
where 68778 is the oid
but it gives :
lo_unlink
-----------
-1
-1
(2 rows)

and when I try to delete that record by:
delete from tablename where id=1;
it goes on hang.
I want to drop this table and create a new one with the same name. But I am
stuck.
Any help would be greatly appreciated.
Thanks,
Rai
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