Eeek! Major problem after reload with tsearch2

Ok, I found out what was going on with the tsearch2 module and reloading
after an upgrade to 8.0.1 from 7.4.1

The data now loads cleanly, and selects are fine.

HOWEVER, when I attempt an update, I issue the following SQL command (this
table has a tsearch2 vector in it:)

update post set invisible='0' where ordinal='2843'

And get back:

ERROR:  cache lookup failed for function 36476 CONTEXT:  SQL statement
"select lt.tokid, map.dict_name from public.pg_ts_cfgmap as map,
public.pg_ts_cfg as cfg, public.token_type( $1 ) as lt where lt.alias =
map.tok_alias and map.ts_name = cfg.ts_name and cfg.oid= $2 order by
lt.tokid desc;"

Aieeee!

A reindex did nothing.

What did I miss?  Looks like there's something missing, but what?!

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