I have been trying out the beta version successfully but then decided to migrate a more up-to-date backup of our live Gemini database. Migration went without any errors (and I have re-migrated and reproduced the problem). I haven't changed the website installation from when it was working.

Now, however, when logging in, I get the error (when using Firefox, IE just seems to go on trying to redirect):

The page isn't redirecting properly
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
    *   This problem can sometimes be caused by disabling or refusing to accept
          cookies.

Looking in geminierrorlog I have repeated sequences of errors, one instance of:

srn: 1507
errormessage: could not initialize a collection: [CounterSoft.Gemini.Commons.UserEN.GlobalGroupMembershipPersist#-1][SQL: SELECT globalgrou0.UserID as UserID1, globalgrou0.globalgroupmembershipid as globalgr11, globalgrou0.globalgroupmembershipid as globalgr1150, globalgrou0.globalgroupid as globalgr2150, globalgrou0.userid as userid150, (select geminiglobalgroups.GlobalGroupName from geminiglobalgroups where geminiglobalgroups.GlobalGroupID = globalgrou0.GlobalGroupID) as formula50 FROM geminiglobalgroupmembership globalgrou0 WHERE globalgrou0_.UserID=?]      
stacktrace: at NHibernate.Loader.Loader.LoadCollection(ISessionImplementor session, Object id, IType type)     at NHibernate.Loader.Collection.CollectionLoader.Initialize(Object id, ISessionImplementor session)     at NHibernate.Persister.Collection.AbstractCollectionPersister.Initialize(Object key, ISessionImplementor session)     at NHibernate.Impl.SessionImpl.InitializeCollection(IPersistentCollection collection, Boolean writing)     at NHibernate.Collection.AbstractPersistentCollection.ForceInitialization()     at NHibernate.Impl.SessionImpl.InitializeNonLazyCollections()     at NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)     at NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters)     at NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters queryParameters, ISet querySpaces, IType[] resultTypes)     at NHibernate.Impl.SessionI   
otherinfo: NHibernate   
created: 2008-05-02 10:27:42.290

followed by six instances of:

srn: 1508   
errormessage: Object reference not set to an instance of an object.      
stacktrace: at CounterSoft.Gemini.Commons.GeminiHelper.ReplaceSpurious(String text)     at (Object , Object[] , SetterCallback )     at NHibernate.Bytecode.Lightweight.AccessOptimizer.SetPropertyValues(Object target, Object[] values)     at NHibernate.Persister.Entity.AbstractEntityPersister.SetPropertyValues(Object obj, Object[] values)     at NHibernate.Impl.SessionImpl.InitializeEntity(Object obj)     at NHibernate.Loader.Loader.InitializeEntitiesAndCollections(IList hydratedObjects, Object resultSetId, ISessionImplementor session)     at NHibernate.Loader.Loader.DoQuery(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)     at NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)     at NHibernate.Loader.Loader.LoadCollection(ISessionImplementor session, Object id, IType type)   
otherinfo: CounterSoft.Gemini.Commons   
created: 2008-05-02 10:27:42.290

I have found several references to issues like this but nothing that seems quite the same - help please!