If quit Logos 4.6a Beta 4 while have a lot to index, then launch Logos 4.6a Beta 4 on OS X 10.8.2, another Logos 4 Indexer process is started so had two Logos 4 Indexer processes running at the same time.
The Logos4.log has a message:
IndexerProcess | Indexer is not running for user ########.###.
Keep Smiling [:)]