Bug#607513: Compositing keeps disabled after last system upgrade

[Debian]

Package: composite
Justification: renders package unusable
Severity: grave

*** Please type your report below this line ***

I made an system upgrade (about 120 packages) after the last upgrade at 06.12.2010.
Now after the login the compositing is disabled and can't be activated.
Before it works perfect.

Of course I tried to activate it with ALT + SHIFT + F12
I attach an screenshot with the system message trying to enable it.

In the .xsession-errors i can find

kdeinit4: preparing to launch /usr/bin/plasma-desktop
kwin(2422): Compositing self-check failed, disabling compositing.
kdeinit4: preparing to launch /usr/bin/knotify4

and

kglobalaccel(2424) KGlobalAccelImpl::x11Event: Got XKeyPress event
kglobalaccel(2424) GlobalShortcutsRegistry::keyPressed: "Alt+Shift+F12" = "Suspend Compositing"
kwin(2422): Compositing self-check failed, disabling compositing.
kwin(2422): Failed to initialize compositing, compositing disabled
kwin(2422): Consult http://techbase.kde.org/Projects/KWin/4.0-release-notes#Setting_up
plasma-desktop(2428): Failed to lock file "/var/tmp/kdecache-karsten/kpc/plasma_theme_oxygen.lock" , last result = 1
plasma-desktop(2428): Failed to lock file "/var/tmp/kdecache-karsten/kpc/plasma_theme_oxygen.lock" , last result = 1
systemsettings(2509)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
kdeinit4: preparing to launch /usr/bin/systemsettings

I attached the complete file.


-- System Information:
Debian Release: squeeze/sid
   APT prefers testing
   APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash


Regards
Karsten

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