Users can't logout when using the openid plugin with google apps auth. the /logout function returns and the user remains logged in. Expect that you should be actually logged out and need to relogin.

Upon attempting logout I see the following in the logs:

Starting discovery on URL identifier: https://www.google.com/accounts/...
INFO org.openid4java.discovery.yadis.YadisResolver discover
Yadis discovered 1 endpoints from: https://www.google.com/accounts/...
INFO org.openid4java.discovery.Discovery discover
Discovered 1 OpenID endpoints.
INFO org.openid4java.consumer.ConsumerManager associate
Trying to associate with https://www.google.com/a/...
INFO org.openid4java.consumer.ConsumerManager associate
Found an existing association: ...
INFO org.openid4java.consumer.ConsumerManager authenticate
Creating authentication request for OP-endpoint: https://www.google.com/...
INFO org.openid4java.server.RealmVerifier match...
INFO org.openid4java.consumer.ConsumerManager verify
Verifying authentication response...
INFO org.openid4java.consumer.ConsumerManager verify
Received positive auth response.
INFO org.openid4java.discovery.Discovery discover
Starting discovery on URL identifier: https://www.google.com/accounts/...
INFO org.openid4java.discovery.yadis.YadisResolver discover
Yadis discovered 1 endpoints from: https://www.google.com/accounts/...
INFO org.openid4java.discovery.Discovery discover
Discovered 1 OpenID endpoints.
INFO org.openid4java.consumer.ConsumerManager verifySignature
Found association: ...
INFO org.openid4java.consumer.ConsumerManager verifySignature
Verification succeeded for:...