Issue with UPDATE statement on v8

Hello,

I'm sorry if this has been sent to the community multiple times.  I am
not able to determine whether my posts have gotten through.  If you have
rec'd this multiple times, please let me know.

We have recently migrated to Postgres 8 (not sure of exactly which
build).  We have noticed that a few functions that were working
previously are no longer behaving as expected.  One function in
particular is giving me a strange result.

The function giving us the problem is much more complicated, but for
simplicity I've included one that is easier to read and results in the
same behavior.

UPDATE t_summary
SET        availability = 7
WHERE  oid = 28245084

When this query is executed (within a function or without) the database
will simply hang.  If the UPDATE is turned into a SELECT, the query
works just fine.  For some reason, the UPDATE is just not working.  This
same function/query works fines in Postgres 7.2.

The schema for the targeted table is shown below.

CREATE TABLE t_summary (    id                              varchar(20) NULL,   availability                 int4 NULL
DEFAULT0, 
)

Has anyone else experienced a similar issue?  If more information is
needed to determine the problem, please let me know.  I've trimmed down
the function's query and table's schema for this posting.

Thanks in advance!

kh
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