Mouse pointer not displayed unless mouse attached

I have an Ubuntu machine that is running synergyc. I connect it to a Windows 7 synergy server.

After a reboot, there is no mouse pointer displayed when I move the mouse in the appropriate direction from the synergy server. I can see buttons display their mouse-over animation, launcher icons display their tooltips, and I can click all widgets (although clicking the intended one is difficult).

Without logging off, I connected a mouse. The pointer was displayed. I disconnected the mouse, and the pointer remained, even responding correctly to the synergy mouse events.

I saw the expected behaviour before upgrading to saucy.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity 7.1.2+13.10.20131014.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
Uname: Linux 3.8.0-31-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 319.32 Wed Jun 19 15:51:20 PDT 2013
 GCC version: gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8)
.tmp.unity.support.test.0:

ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Tue Oct 22 08:35:36 2013
DistUpgraded: 2013-10-17 10:04:30,052 DEBUG enabling apt cron job
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus: nvidia-319, 319.32, 3.8.0-31-generic, x86_64: installed
GraphicsCard:
 NVIDIA Corporation GT218 [ION] [10de:0a64] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: ZOTAC International (MCO) Ltd. Device [19da:3100]
InstallationDate: Installed on 2013-10-04 (17 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-31-generic root=UUID=58500d33-7719-4522-bd87-83ebbae7dd99 ro quiet splash
SourcePackage: unity
UpgradeStatus: Upgraded to saucy on 2013-10-17 (4 days ago)
dmi.bios.date: 05/05/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080016
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: NM10
dmi.board.vendor: ZOTAC
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080016:bd05/05/2011:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnZOTAC:rnNM10:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Fri Oct 18 10:20:39 2013
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input Logitech USB Optical Mouse MOUSE, id 8
xserver.errors:
 Failed to load /usr/lib/xorg/modules/libglamoregl.so: /usr/lib/xorg/modules/libglamoregl.so: undefined symbol: _glapi_tls_Context
 Failed to load module "glamoregl" (loader failed, 7)
 open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.14.3-3ubuntu2