Synapse error with LXDE desktop.

I think it'll be best to install synapse-dbg, and run `gdb -ex run -ex bt synapse`. Paste the output when it crashes.

Thanks for the quick reply. Here is the output:

$ gdb -ex run -ex bt synapse
GNU gdb (GDB) 7.2-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/synapse...Reading symbols from /usr/lib/debug/usr/bin/synapse...done.
done.
Starting program: /usr/bin/synapse
[Thread debugging using libthread_db enabled]

** (synapse:3575): WARNING **: desktop-file-service.vala:267: Desktop session type is not recognized, assuming GNOME.
[New Thread 0xb7ddcb70 (LWP 3578)]
[19:24:19.882682 Info] [UILauncher] Binding activation to <Control>space
(synapse:3575): GtkHotkey-DEBUG: Listener Type: GtkHotkeyX11Listener
[19:24:19.920206 Info] [GuiSynapseWindow] Screen is NOT composited.

Program received signal SIGSEGV, Segmentation fault.
0x00b742c6 in ?? () from /usr/lib/libzeitgeist-1.0.so.0
#0 0x00b742c6 in ?? () from /usr/lib/libzeitgeist-1.0.so.0
#1 0x00b73014 in zeitgeist_data_source_registry_get_data_sources_finish ()
   from /usr/lib/libzeitgeist-1.0.so.0
#2 0x080a10b9 in synapse_zeitgeist_relevancy_backend_check_data_sources_co (
    data=0x8143840) at relevancy-backend-zg.c:307
#3 0x00b72ce8 in ?? () from /usr/lib/libzeitgeist-1.0.so.0
#4 0x00ad357f in g_simple_async_result_complete ()
   from /usr/lib/libgio-2.0.so.0
#5 0x00b805bc in ?? () from /usr/lib/libzeitgeist-1.0.so.0
#6 0x00ad357f in g_simple_async_result_complete ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/libgio-2.0.so.0
#7 0x011d79c8 in ?? () from /usr/lib/libeggdbus-1.so.0
#8 0x005e5831 in ?? () from /lib/libdbus-1.so.3
#9 0x005d3976 in ?? () from /lib/libdbus-1.so.3
#10 0x005d6b82 in dbus_connection_dispatch () from /lib/libdbus-1.so.3
#11 0x005af39d in ?? () from /usr/lib/libdbus-glib-1.so.2
#12 0x00c24855 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#13 0x00c28668 in ?? () from /lib/libglib-2.0.so.0
#14 0x00c28ba7 in g_main_loop_run () from /lib/libglib-2.0.so.0
#15 0x003071d9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#16 0x08056c85 in synapse_ui_launcher_main (argv=0xbffff9c4, argv_length1=1)
    at synapse-main.c:760
#17 0x08056cc0 in main (argc=1, argv=0xbffff9c4) at synapse-main.c:789
(gdb)