After poking arround some more, I found that the "vacuum analyze" is
causing problems with the "<" and ">" operators. The "> 0" in the SELECT
for "/d <table>" and "/dS" commands in psql cause the error.
I verified that any simple query using the "<" or ">" operators fail
with the same message...
ERROR: fmgr_info: function 0: cache lookup failed
...after using the "vacuum analyse" command.
But, only after vacuuming any relation that was created and populated by
me. Vacumming system catalogs poses no problems.
I did go back to 6.2.0. Found no problems there.
-James