boolean operator on interval producing strange results

We updated our production server to postgresql 8.2.3 yesterday.  This
query is giving different results than on our development box:

development:
# select ((now() - '1 day'::interval)::timestamp - now()) < 0;
 ?column?
----------
 t
(1 row)

production
#  select ((now() - '1 day'::interval)::timestamp - now()) < 0;
 ?column?
----------
 f  <-- looks busted to me
(1 row)

both servers are redhat fc4, same version postgresql. only difference
I know of is development is a little behind on yum update.  can
anybody think of anything that might have influenced this?

merlin