Version:            (using KDE KDE 3.5.1)
Installed from:    Ubuntu Packages

I have clicked "Show desktop", then clicked on "Music CD" shortcut on desktop (which appears when CD Audio is inserted). Then KWin crashed.

I cannot reproduce it, I will try with other configurations. I have noticed there were some error messages displayed by NX client when it happened, but I'm not sure if it matters.

Note that it is not the bug 117677 - the backtrace is different.
Short backtrace (I will attach full backtrace):
[KCrash handler]
#6  0x000003e0 in ?? ()
#7  0xb67bb7a7 in KWinInternal::Client::isOnCurrentDesktop ()
   from /usr/lib/libkdeinit_kwin.so
#8  0xb67ec9c8 in KWinInternal::Client::unminimize ()
   from /usr/lib/libkdeinit_kwin.so
#9  0xb67ecb08 in KWinInternal::Workspace::resetShowingDesktop ()
   from /usr/lib/libkdeinit_kwin.so
#10 0xb67ffd49 in KWinInternal::Client::manage ()
   from /usr/lib/libkdeinit_kwin.so
#11 0xb680000a in KWinInternal::Workspace::createClient ()
   from /usr/lib/libkdeinit_kwin.so
#12 0xb6804b31 in KWinInternal::Workspace::workspaceEvent ()
   from /usr/lib/libkdeinit_kwin.so
#13 0xb6804c66 in KWinInternal::Application::x11EventFilter ()
   from /usr/lib/libkdeinit_kwin.so