I got the signal 5 crash the first time I attempted to connect my Logitech MX1000 bluetooth mouse (using Bluetooth -> Preferences -> Services-> Input Service->Add->Connect). However I tried a second time (without rebooting) and to my delight it worked fine, including having it magically start working as a display input device. Have to find out how that works, used to have to edit xorg.conf.

I also uploaded the crash report but don't know how to attach (could have cut and pasted from the crash report window I suppose but did not think of it then). I had just done a package update and reboot though so the versions should be the latest today.
I am using a Dell Inspiron 6400 with nvidia drivers.

This was in /var/log/messages but I assume that it was from the second working attempt:
Mar 11 13:13:34 john-laptop kernel: [ 2464.967486] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
Mar 11 13:13:34 john-laptop kernel: [ 2464.968271] input: Logitech MX1000 mouse as /devices/pci0000:00/0000:00:1d.3/usb4/4-2/4-2.1/4-2.1:1.0/hci0/acl0007617FD71A/input/input10

This extract from syslog might be to do with the crash and later successful attempt:
Mar 11 13:10:30 john-laptop audio[7504]: /org/bluez/audio: org.bluez.audio.Manager.ListDevices()
Mar 11 13:10:30 john-laptop input[7510]: /org/bluez/input: org.bluez.input.Manager.ListDevices()
Mar 11 13:10:56 john-laptop NetworkManager: <debug> [1205201456.526536] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/bluetooth_acl_7617fd71a'). 
Mar 11 13:10:56 john-laptop input[7510]: Incoming connection on PSM 17
Mar 11 13:10:56 john-laptop input[7510]: Incoming connection on PSM 19
Mar 11 13:11:09 john-laptop input[7510]: /org/bluez/input: org.bluez.input.Manager.CreateSecureDevice()
Mar 11 13:11:17 john-laptop hcid[7490]: connect(): Connection timed out (110)
Mar 11 13:11:17 john-laptop input[7510]: GetRemoteServiceHandles: org.bluez.Error.ConnectionAttemptFailed(Connection timed out)
Mar 11 13:11:17 john-laptop NetworkManager: <debug> [1205201477.673999] nm_hal_device_removed(): Device removed (hal udi is '/org/freedesktop/Hal/devices/bluetooth_acl_7617fd71a'). 
Mar 11 13:12:51 john-laptop audio[7504]: /org/bluez/audio: org.bluez.audio.Manager.ListDevices()
Mar 11 13:12:51 john-laptop input[7510]: /org/bluez/input: org.bluez.input.Manager.ListDevices()
Mar 11 13:13:16 john-laptop input[7510]: /org/bluez/input: org.bluez.input.Manager.CreateSecureDevice()
Mar 11 13:13:16 john-laptop NetworkManager: <debug> [1205201596.415533] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/bluetooth_acl_7617fd71a'). 
Mar 11 13:13:20 john-laptop input[7510]: Created input device: /org/bluez/input/pointing0
Mar 11 13:13:20 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetAdapter()
Mar 11 13:13:20 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetAddress()
Mar 11 13:13:20 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetName()
Mar 11 13:13:20 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetAdapter()
Mar 11 13:13:20 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetAddress()
Mar 11 13:13:20 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetName()
Mar 11 13:13:22 john-laptop NetworkManager: <debug> [1205201602.267420] nm_hal_device_removed(): Device removed (hal udi is '/org/freedesktop/Hal/devices/bluetooth_acl_7617fd71a'). 
Mar 11 13:13:33 john-laptop NetworkManager: <debug> [1205201613.775378] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/bluetooth_acl_7617fd71a'). 
Mar 11 13:13:34 john-laptop input[7510]: Incoming connection on PSM 17
Mar 11 13:13:34 john-laptop input[7510]: Incoming connection on PSM 19
Mar 11 13:13:34 john-laptop input[7510]: New input device 00:07:61:7F:D7:1A (Logitech MX1000 mouse)
Mar 11 13:13:34 john-laptop kernel: [ 2464.967486] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
Mar 11 13:13:34 john-laptop kernel: [ 2464.968271] input: Logitech MX1000 mouse as /devices/pci0000:00/0000:00:1d.3/usb4/4-2/4-2.1/4-2.1:1.0/hci0/acl0007617FD71A/input/input10
Mar 11 13:13:34 john-laptop NetworkManager: <debug> [1205201614.251061] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/bluetooth_acl_7617fd71a_logicaldev_input'). 
Mar 11 13:17:01 john-laptop /USR/SBIN/CRON[10605]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Mar 11 13:18:26 john-laptop audio[7504]: /org/bluez/audio: org.bluez.audio.Manager.ListDevices()
Mar 11 13:18:26 john-laptop input[7510]: /org/bluez/input: org.bluez.input.Manager.ListDevices()
Mar 11 13:18:27 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetAdapter()
Mar 11 13:18:27 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetAddress()
Mar 11 13:18:27 john-laptop input[7510]: /org/bluez/input/pointing0: org.bluez.input.Device.GetName()