If Organizer fails to launch, try following steps –
Delete the Organizer preferences [Organizer preferences are located at //Users/[Your User Account]/Library/Preferences/]. Delete the file “com.Adobe.Elements Organizer.11.0.plist” from above location and relaunch the Organizer.
Go to Start>Run>type %appdata%. Browse to Adobe/Elements Organizer/10.0/Organizer and delete psa.prf file.
If that does not help, it could be that your catalog got corrupted. To fix that, hold down your Shift key while launching the Organizer. This would open up the Catalog Manager. Highlight your catalog at the bottom of the window, and choose "Repair" and then "Optimize".