I found recently that non-grey icons in panel tray( like opera's, workrave's, easystroke's tray icon) sometimes disappear for no reason suddenly in Ubuntu 12.04, and meanwhile the application still runs fine. Grey icon like dropbox's still appear properly.
Afterwards if I restart the application, the tray icon is shown finely again.
In addition I changed setting in dconf to set all icons appear at the tray.
I found when you switch desktops with ctrl+alt+arrows , the disappeared icons appear at the time of switch instantly.
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.tmp.unity.support.test.0:
ApportVersion: 2.0.1-0ubuntu4
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,dbus,place,resize,grid,session,mousepoll,wall,snap,commands,imgpng,gnomecompat,vpswitch,move,regex,animation,unitymtgrabhandles,workarounds,expo,fade,ezoom,scale,scaleaddon,scalefilter,unityshell]
CompositorRunning: compiz
DistUpgraded: Fresh install
DistroCodename: precise
DistroRelease: Ubuntu 12.04
DistroVariant: ubuntu
DkmsStatus:
tp-smapi, 0.41, 3.2.0-23-generic, x86_64: installed
virtualbox, 4.1.12, 3.2.0-23-generic, x86_64: installed
GraphicsCard:
Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:20e4]
Subsystem: Lenovo Device [17aa:20e4]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
MachineType: LENOVO 7457CH2
Package: unity 5.10.0-0ubuntu5
PackageArchitecture: amd64
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=0199f193-bc19-482f-9a61-bca03d4f0e68 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Tags: precise precise precise ubuntu compiz-0.9
Uname: Linux 3.2.0-23-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 12/02/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6DET67WW (3.17 )
dmi.board.name: 7457CH2
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6DET67WW(3.17):bd12/02/2010:svnLENOVO:pn7457CH2:pvrThinkPadX200:rvnLENOVO:rn7457CH2:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 7457CH2
dmi.product.version: ThinkPad X200
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.7.6-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2
apport information