I recently upgraded from cassandra 1.0.10 to 1.1.  Everything worked fine in one environment, but after I upgraded in another, I can't find my keyspace.  When I run, e.g., cassandra-cli with 'use KeySpace;' It tells me that the keyspace doesn't exist.  In the log I see this:

ERROR [MigrationStage:1] 2012-05-15 11:39:48,216 AbstractCassandraDaemon.java (line 134) Exception in thread Thread[MigrationStage:1,5,main]java.lang.AssertionError
        at org.apache.cassandra.db.DefsTable.updateKeyspace(DefsTable.java:441)
        at org.apache.cassandra.db.DefsTable.mergeKeyspaces(DefsTable.java:339)
        at org.apache.cassandra.db.DefsTable.mergeSchema(DefsTable.java:269)
        at org.apache.cassandra.db.DefsTable.mergeRemoteSchema(DefsTable.java:248)
        at org.apache.cassandra.service.MigrationManager$MigrationTask.runMayThrow(MigrationManager.java:416)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)        at java.lang.Thread.run(Thread.java:636)

I can see that the data I would expect still seems to be in the new place (/var/lib/cassandra/data/App/ColFamily/App-DomainName-*) on all nodes.

What am I missing?

Thanks,
Casey