I frequently see this in my syslog from gnome-session when I log in: WARNING: Could not launch application '10cb2c80dc6b09fb7d124559128294371400000023760030.desktop': Unable to start application: Failed to execute child process "evolution-exchange-storage" (No such file or directory) Evolution-exchange-storage is in /usr/libexec/evolution/2.28, so either the gnome session save file needs to have a full path to the executable in it, or it needs to not be generating a gnome session save file (if, indeed, it isn't supposed to be restarted when the user logs in).
Moving this upstream for better visibility. Please see [1] for further updates. [1] http://bugzilla.gnome.org/show_bug.cgi?id=587213