OK, this is going to be kind of a long shot, since it's a big system (which I don't claim to fully understand, yet), and the problem might not be with NHibernate itself, and I'm even having trouble reproducing it, but...

I've got a class with a <dynamic-component> section, and when I run a query on it (through my ASP.NET MVC app), it fails, but only sometimes. (Yeah, the worst kind!)

The exception I'm seeing is:

NHibernate.QueryException: could not resolve property:
Attributes.MyAttributeName of: MyClassName
   at NHibernate.Persister.Entity.AbstractPropertyMapping.GetColumns(String propertyName)
   at NHibernate.Persister.Entity.AbstractPropertyMapping.ToColumns(String alias, String propertyName)
   at NHibernate.Persister.Entity.BasicEntityPropertyMapping.ToColumns(String alias, String propertyName)
   at NHibernate.Persister.Entity.AbstractEntityPersister.ToColumns(String alias, String propertyName)
   at NHibernate.Loader.Criteria.CriteriaQueryTranslator.GetColumns(String propertyName, ICriteria subcriteria)
   at NHibernate.Loader.Criteria.CriteriaQueryTranslator.GetColumnsUsingProjection(ICriteria subcriteria, String propertyName)
   at NHibernate.Criterion.CriterionUtil.GetColumnNamesUsingPropertyName(ICriteriaQuery criteriaQuery, ICriteria criteria, String propertyName, Object value, ICriterion critertion)
   at NHibernate.Criterion.CriterionUtil.GetColumnNamesForSimpleExpression(String propertyName, IProjection projection, ICriteriaQuery criteriaQuery, ICriteria criteria, IDictionary`2 enabledFilters, ICriterion criterion, Object value)
   at NHibernate.Criterion.SimpleExpression.ToSqlString(ICriteria criteria, ICriteriaQuery criteriaQuery, IDictionary`2 enabledFilters)
   at NHibernate.Loader.Criteria.CriteriaQueryTranslator.GetWhereCondition(IDictionary`2 enabledFilters)
   at NHibernate.Loader.Criteria.CriteriaJoinWalker..ctor(IOuterJoinLoadable persister, CriteriaQueryTranslator translator, ISessionFactoryImplementor factory, CriteriaImpl criteria, String rootEntityName, IDictionary`2 enabledFilters)
   at NHibernate.Loader.Criteria.CriteriaLoader..ctor(IOuterJoinLoadable persister, ISessionFactoryImplementor factory, CriteriaImpl rootCriteria, String rootEntityName, IDictionary`2 enabledFilters)
   at NHibernate.Impl.SessionImpl.List(CriteriaImpl criteria, IList results)
   at NHibernate.Impl.CriteriaImpl.List(IList results)
   at NHibernate.Impl.CriteriaImpl.UniqueResult[T]()
...my code below here...

Can anybody explain exactly what this QueryException means, i.e., so I can have an idea of what exactly it thinks is going wrong?

Thanks!