Distributed envinronment

I've integrated NHibernate.Search into our company platform DAL and it's works very fine. Compliments! Since two months ago, our backend servers, where the DAL with NHibernate runs, are in a NLB environment so different servers can update the Lucene file base indexes at the same time. I've encountered a problem in the NHibernate.Search.Impl.Workspace file because it is not able to correct manage the lock: (Monitor.Enter & Monitor.Exit) and when it try to close the writer in the Cleanup proc of the same class. Is there a new version that is able to run on distributed environments or can I do anything to solve the problem? Thank u very much. --Vito