We are having a very similar problem.  After updating the ehcahe.jar file in 
the portal/lib directory, we get the following exceptions:

11:42:20,888 ERROR [HibernateStore] failed to initialize file system
java.lang.NullPointerException


and later on..

org.jboss.portal.common.transaction.NestedException: 
org.hibernate.cache.CacheException: Attempt to restart an already started 
EhCacheProvider. Use sessionFactory.close()  between repeated calls to 
buildSessionFactory. Consider using 
net.sf.ehcache.hibernate.SingletonEhCacheProvider. Error from  ehcache was: 
Cannot parseConfiguration CacheManager. Attempt to create a new instance of 
CacheManager using the diskStorePath "..." which is already used

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