Public bug reported:

Binary package hint: qjackctl

1) Start Qjackctl.
2) Move the cursor on its windows or its tray icon.
3) The graphical server crashes, and the login screen is displayed.

I don't know if it has something to do with it, but:
- when I start Qjackctl from terminal i get this message:
Xlib:  extension "RANDR" missing on display ":0.0".
The program starts, then the same behaviour as above.

When I try to enable desktop effects, I get this message:
The Composite extension is not available
even if the latest proprietary NVIDIA drivers are installed.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: qjackctl 0.3.6-1build1
ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
Uname: Linux 2.6.35-24-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Mon Dec 20 18:35:00 2010
InstallationMedia: Ubuntu-Studio 10.10 "Maverick Meerkat" - Release amd64 
(20101008)
ProcEnviron:
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: qjackctl

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


** Tags: amd64 apport-bug maverick

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https://bugs.launchpad.net/bugs/692657

Title:
  Qjackctl makes the graphical server crash

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