Repro: (1) set to sync settings in a dropbox folder, (2) add a custom web search, (3) close preferences, (4) reopen preferences, expect to see new addition, actually its not there
View repro video: http://screencast.com/t/kndRE4aWLBB
Alfred v2.3 (264)
OSX 10.9.2
Dropbox v2.6.33
continual repro, haven't found a workaround yet