[xwiki-users] XE1.8 cannot browse tree of user created spaces

Hi, I setup XE 1.8 WAR on Ubuntu 8.1 VM with Tomcat6, Sun Java6, Postgres 8.3 with postgresql-8.3-604.jdbc4.jar It seems to be OK except that when I create a New_Space and then attempt to view the page tree in the e.g. Quicklinks > Document index > Tree and myNewSpace I just get a circular rotating arrows "hourglass" cursor next to the tree and that new space index tree never opens. However, existing default spaces like Main and Blog open into their tree structure. If I look in the Tomcat6 log I see nothing that looks like errors - just stuff like loading plexus context properties, plexus, context initialised. Can anyone suggest a fix? Thanks