postgres 6.5 error

I've installed postgresql 6.4.2 onto linuxppc systems several times before
without problems. I have recently installed the newly released linuxppc-R5
release, which includes an rpm for 6.5-0beta1. I was able to run initdb
just fine. then started the postmaster. ran createdb o.k. then loaded up a
table with psql -e dbname < dbname.sql
this ran fine as well.
But when I try to psql dbname followed by a \d dbname I get the following
error:

ERROR:  typeidTypeRelid: Invalid type - oid = 0

Any suggestions ?

Kevin

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