Mac OS 10.10.1
Launched Logos from the Dock. Synchronizing and Preparing dialogs appeared as normal. However, when they went away, no program window appeared. Activity Monitor listed the app as Not Responding and showed 0 activity for Logos. Indexer was not running.
This has happened a couple of times prior to this, but is not consistent.
Took a Sample
0334.LogosLogs.jackcav.20141126-175430.zip
Forced Quit
4135.Apple Crash Report.rtf
7380.LogosLogs.jackcav.20141126-175528.zip
Logos launched normally and did not request a crash report.