Since the new dash in unity 4.8 transparency in the unity panel is basically unusable. The lower the opacity set the more obviously this can be seen though it affects all decreases from the default
Also seen is that the app indicator area is 'separated' from the rest of the panel, again seen easier by setting a very low opacity
What is curious with the new dash is that it extends into the panel (the panel becomes part of the dash.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.8.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-8.11-generic 3.0.1
Uname: Linux 3.0.0-8-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,expo,move,compiztoolbox,place,imgpng,gnomecompat,ezoom,resize,fade,scale,session,unityshell,cube,rotate]
Date: Mon Aug 15 18:42:44 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110815)
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
This problem does not happen if blur is disabled, confirming it here.