Launcher icons randomly change color

[scrawl]

There are 2 applications in my Launcher (Smuxi and Rhythmbox, from official repositories) that randomly change their background color every few hours, or sometimes every few minutes (if I had to guess). There are two different states for these icons, of which I have attached screenshots. The background is either green-yellow (which I believe is the correct color), or plain white.

This never happened with any other icons in my launcher. Please fix, it's driving me nuts :(

I'm guessing that either the background algorithm is non-deterministic for some reason, or you have an uninitialized variable somewhere?

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.0+14.04.20140416-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CurrentDesktop: Unity
Date: Mon Apr 28 21:03:06 2014
InstallationDate: Installed on 2014-04-25 (3 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[scrawl (scrawl-deactivatedaccount)]

I can now reproduce the bug consistently:
 - Restart compiz (compiz --replace): Icon backgrounds are now white
 - Switch to a different window using Alt-Tab switcher: Icon backgrounds are now green-yellow

[scrawl (scrawl-deactivatedaccount)]

Just noticed it also happens with pidgin.