Template composer cannot edit the hst configuration

When the gogreen tag is deployed to acceptance, the template composer does not function.
The loading bar is caught in an endless loop.

In the logs, lots of the following warnings are shown:

10.06.2011 16:52:25 WARN [org.hippoecm.hst.core.container.JCRSessionStatefulConcurrencyValve.invoke():86] For a sessionstatefull jcr session we always expect a jcr session of type 'org.hippoecm.hst.core.jcr.LazySession'. However, there the session is of type '$Proxy22'. We refresh this session now.
10.06.2011 16:52:27 WARN [org.hippoecm.hst.core.container.JCRSessionStatefulConcurrencyValve.invoke():86] For a sessionstatefull jcr session we always expect a jcr session of type 'org.hippoecm.hst.core.jcr.LazySession'. However, there the session is of type '$Proxy22'. We refresh this session now.
10.06.2011 16:52:37 WARN [org.hippoecm.hst.core.container.JCRSessionStatefulConcurrencyValve.invoke():86] For a sessionstatefull jcr session we always expect a jcr session of type 'org.hippoecm.hst.core.jcr.LazySession'. However, there the session is of type '$Proxy22'. We refresh this session now.
10.06.2011 16:52:37 ERROR [org.hippoecm.hst.pagecomposer.jaxrs.services.ContainerItemComponentResource.setNode():106] Unable to get the parameters of the component javax.jcr.AccessDeniedException: /hst:hst/hst:configurations/hippogogreen/hst:pages/homepage/main/home-boxes-intro/banner/hst:parameternames: not allowed to add or modify item
javax.jcr.AccessDeniedException: /hst:hst/hst:configurations/hippogogreen/hst:pages/homepage/main/home-boxes-intro/banner/hst:parameternames: not allowed to add or modify item
at org.apache.jackrabbit.core.ItemSaveOperation.validateTransientItems(ItemSaveOperation.java:472)