Bug#766169: Same here: missing window decoration on kde

Tue Oct 21 20:29:41 UTC 2014

I had the problem of missing window decorations too and also other 
functionality of kwin stopped working (right-click menu, Alt+mouse for 
dragging windows).

I upgraded with aptitude safe-upgrade and that turned out to be not enough.
By doing an aptitude full-upgrade, the packages libegl1-nvidia and libnvidia-
eglcore got installed and that fixed the problem for me.

HTH,
  Diederik
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