I have tried the following on a clean install of Ubuntu 12.04:
1. Installed nxnode_3.5.0-9_i386.deb and nxserver_3.5.0-11_i386.deb from 
nomachine.com
2. Installed libxrandr2_1.4.0-1ubuntu1_i386.deb from 
https://launchpad.net/ubuntu/+source/libxrandr (under Raring) - note that I'm 
installing a Raring binary package on a Precise system, but it seems to work 
fine.

I can confirm that the Kwin crash is gone, from as much as I could test.
However, I've noticed another problem:

When the main NX window is resized, the Kwin desktop does not get
resized with it.  The root window does change the resolution, though,
which is evidenced by the fact that windows can be dragged into the
newly added area.  See the attached screenshot for a visual explanation
of the problem.

I discovered that downgrading libxfixes3 package to the one from Oneric
(isntall package libxfixes3_5.0-4_i386.deb) enables the Kwin desktop
window to be resized together with the main NX window.

** Attachment added: "Kwin desktop window not resizing together when main NX 
window is resized"
   
https://bugs.launchpad.net/ubuntu/precise/+source/libxrandr/+bug/985202/+attachment/3564205/+files/screenshot-kde-not-resizing-in-nx.jpg

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to libxrandr in Ubuntu.
https://bugs.launchpad.net/bugs/985202

Title:
  libx11 causes kwin to crash on login (over NX protocol)

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