Unity broken after latest update; compiz crashed with SIGSEGV in getCompPluginVTable20090315_unityshell()

compiz crashed with SIGSEGV in getCompPluginVTable20090315_unityshell()

Note: I am testing Unity 7.

The latest daily apt-get update && apt-get dist-upgrade run broke Unity.
I am presented with an empty desktop. No Launcher, no Panel.

When trying to launch unity from the terminal, it ends up with a core
dump.

Workaround for now - use Gnome-Shell. ;)

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: unity 6.12.0daily13.03.29.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-8.17-generic 3.8.0
Uname: Linux 3.8.0-8-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
Date: Fri Mar 29 17:46:39 2013
ExecutablePath: /usr/bin/compiz
MarkForUpload: True
ProcCmdline: compiz
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fabcc5bc455 <getCompPluginVTable20090315_unityshell+21>: mov (%rbx),%rax
 PC (0x7fabcc5bc455) ok
 source "(%rbx)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 getCompPluginVTable20090315_unityshell () from /usr/lib/compiz/libunityshell.so
 ?? () from /usr/lib/libcompiz_core.so.ABI-20130125
 CompPlugin::load(char const*) () from /usr/lib/libcompiz_core.so.ABI-20130125
 compiz::private_screen::PluginManager::updatePlugins(CompScreen*, std::vector<CompOption::Value, std::allocator<CompOption::Value> > const&) () from /usr/lib/libcompiz_core.so.ABI-20130125
 PrivateScreen::processEvents() () from /usr/lib/libcompiz_core.so.ABI-20130125
Title: compiz crashed with SIGSEGV in getCompPluginVTable20090315_unityshell()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New