I just found the following suspicious line in my .xession-errors:
(mutter:1679): libunity-private-CRITICAL **: file places-place.c: line 571: uncaught error: Failed to execute program /use/libexec/unity-applications-daemon: Success (dbus-glib-error-quark, 23)
So indeed, /use/libexec/unity-applications-daemon fails to start, and for some reason the Vala DBus layer causes a crash under these circumstances.
I just found the following suspicious line in my .xession-errors:
(mutter:1679): libunity- private- CRITICAL **: file places-place.c: line 571: uncaught error: Failed to execute program /use/libexec/ unity-applicati ons-daemon: Success (dbus-glib- error-quark, 23)
So indeed, /use/libexec/ unity-applicati ons-daemon fails to start, and for some reason the Vala DBus layer causes a crash under these circumstances.