The metadata views of Oracle Workflow use the variable userenv('LANG') a lot (see example below).
It costed me 2 hours to figure out why certain views were empty when examined from one machine and not empty from another client.
Well, in case you run into the same problem, this is a possible cause.
CREATE OR REPLACE VIEW WF_LOOKUPS
(ROW_ID, LOOKUP_TYPE, LOOKUP_CODE, PROTECT_LEVEL, CUSTOM_LEVEL,
MEANING, DESCRIPTION)
AS
select /* $Header: wfcorev.sql 26.0 2000/07/05 23:42:38 kma ship $ */
B.ROWID ROW_ID,
B.LOOKUP_TYPE,
B.LOOKUP_CODE,
B.PROTECT_LEVEL,
B.CUSTOM_LEVEL,
B.MEANING,
B.DESCRIPTION
from WF_LOOKUPS_TL B
where B.LANGUAGE = userenv('LANG')