rspec users - Jul 2008 - Baffled by error running rake rspec:models

In my application, we connect to 2 databases, so we make a lot of  
specs to test this type of interaction.  When I run individual model  
specs using spec, or using rake spec SPEC=xxx, they run *fine*. When I  
run rake spec:models, all the specs which connect to the 2nd database  
fail on errors like this:

OCIError in ''WellLicense  should identify EIS data is not
available''
ORA-01017: invalid username/password; logon denied
env.c:257:in oci8lib.so
./spec/models/well_license2_spec.rb:6:in `new''
./spec/models/well_license2_spec.rb:6:

This WAS working a couple of days ago.  I did update from the beta  
version of the Oracle Intel InstantClient for Mac to the officially  
released version, but I can''t see how that would make a difference,  
especially when running the specs individually works.

This has to be some strange configuration error, but I''m baffled.   
I''ve spent hours trying to track it down.  Help!

database.yml entry:

data_centre:
  adapter: oracle_enhanced
  database: xe
  username: XXXXXX
  password: YYYYYY

And our database connection is established in  
data_center_spec_helper.rb like so:

LabRecord 
.establish_connection(ActiveRecord::Base.configurations[''data_centre''])

Regards, Lori