Pot. KWin crashed and for some reason did not restart.
Does "alt+tab" still work as expected? Can you select windows with the mouse?

From what to what decoration did you change?
Did you get a window where you could click on "developer information"?

Did this happen immediately after an update (and eventuall w/o logout/login)?

In doubt, set the decoration to "oxygen" and run "kwin --replace&" (eg. from alt+f2)

If you can no more login with kwin running, edit [1] ~/.kde4/share/config/kwinrc and in [Style] set PluginLib=kwin3_oxygen

 [1] from VT1, using vim, nano, emacs etc.

>> Did you get a window where you could click on "developer information"?
No.

>> Does "alt+tab" still work as expected? Can you select windows with the mouse?
Yes, Alt + Tab works.
Yes, I can move windows (Alt + click mouse on window and move window).

>> Did this happen immediately after an update (and eventuall w/o logout/login)?
It happend after an update and relogin and change some theme window.

After relogin windows is normal.

After command "kwin --replace":
1. http://s.wapke.ru/files/20130209-104406.jpg
2. http://s.wapke.ru/files/20130209-104532.jpg

Video: http://wapke.ru/other/kwin-bug-window.tar.gz

did that happen exactly during the update? That is 4.10 installed, but 4.9 still running?

>> did that happen exactly during the update? That is 4.10 installed, but 4.9 still running?
No. I installed updates and reboot. Later I changed theme of windows. You can see it on the video.

>> $ kwin --version
>> QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
>> Qt: 4.8.4
>> KDE: 4.10.00
>> KWin: 4.10.00

- is this limited to certain aurorae themes?
- please post the output of "qdbus org.kde.kwin /KWin supportInformation"
- Does this also happen with xrender or when changing the graphicssystem (between "native" and "raster")?

>> is this limited to certain aurorae themes?
This happens when I change some theme of windows (Auroblack, FormaN, Air-Oxegen and some default themes).

>> Does this also happen with xrender or when changing the graphicssystem (between "native" and "raster")?
Yes. I changed graphicssystem on native and raster, but this bug still happen.

>> $ qdbus org.kde.kwin /KWin supportInformation

KWin Support Information:
The following information should be used when requesting support on e.g. http://forum.kde.org.
It provides information about the currently running instance, which options are used,
what OpenGL driver and which effects are running.
Please post the information provided underneath this introductory text to a paste bin service
like http://paste.kde.org instead of pasting into support threads.

==========================

Version
=======
KWin version: 4.10.0
KDE SC version (runtime): 4.10.00
KDE SC version (compile): 4.10.00
Qt Version: 4.8.4

Options
=======
focusPolicy: 0
nextFocusPrefersMouse: false
clickRaise: true
autoRaise: false
autoRaiseInterval: 0
delayFocusInterval: 0
shadeHover: false
shadeHoverInterval: 250
separateScreenFocus: false
activeMouseScreen: false
placement: 4
focusPolicyIsReasonable: true
borderSnapZone: 10
windowSnapZone: 10
centerSnapZone: 0
snapOnlyWhenOverlapping: false
showDesktopIsMinimizeAll: false
rollOverDesktops: false
focusStealingPreventionLevel: 1
legacyFullscreenSupport: false
operationTitlebarDblClick: 
commandActiveTitlebar1: 0
commandActiveTitlebar2: 30
commandActiveTitlebar3: 2
commandInactiveTitlebar1: 4
commandInactiveTitlebar2: 30
commandInactiveTitlebar3: 2
commandWindow1: 7
commandWindow2: 8
commandWindow3: 8
commandWindowWheel: 31
commandAll1: 10
commandAll2: 3
commandAll3: 14
keyCmdAllModKey: 16777251
showGeometryTip: false
condensedTitle: false
electricBorders: true
electricBorderDelay: 150
electricBorderCooldown: 350
electricBorderPushbackPixels: 1
electricBorderMaximize: true
electricBorderTiling: true
electricBorderCornerRatio: 0.25
borderlessMaximizedWindows: false
killPingTimeout: 5000
hideUtilityWindowsForInactive: true
inactiveTabsSkipTaskbar: false
autogroupSimilarWindows: false
autogroupInForeground: true
compositingMode: 1
useCompositing: true
compositingInitialized: true
hiddenPreviews: 1
unredirectFullscreen: false
glSmoothScale: 2
glVSync: true
colorCorrected: false
xrenderSmoothScale: false
maxFpsInterval: 17
refreshRate: 0
vBlankTime: 6144
glDirect: true
glStrictBinding: false
glStrictBindingFollowsDriver: true
glLegacy: false

Screens
=======
Multi-Head: no
Number of Screens: 1
Screen 0 Geometry: 0,0,1366x768

Compositing
===========
Qt Graphics System: raster
Compositing is active
Compositing Type: OpenGL
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Mobile Intel® GM45 Express Chipset 
OpenGL version string: 2.1 Mesa 9.0.2
Driver: Intel
GPU class: i965
OpenGL version: 2.1
Mesa version: 9.0.2
X server version: 1.13.2
Linux kernel version: 3.7.6
Direct rendering: yes
Requires strict binding: no
GLSL shaders:  yes
Texture NPOT support:  yes
Virtual Machine:  no
OpenGL 2 Shaders are used

Loaded Effects:
---------------
kwin4_effect_zoom
kwin4_effect_slidingpopups
kwin4_effect_coverswitch
kwin4_effect_minimizeanimation
kwin4_effect_screenshot
kwin4_effect_slide
kwin4_effect_desktopgrid
kwin4_effect_flipswitch
kwin4_effect_fade
kwin4_effect_dialogparent
kwin4_effect_highlightwindow
kwin4_effect_taskbarthumbnail
kwin4_effect_presentwindows
kwin4_effect_blur
kwin4_effect_logout
kwin4_effect_dashboard
kwin4_effect_outline
kwin4_effect_startupfeedback

Currently Active Effects:
-------------------------
kwin4_effect_blur

Effect Settings:
----------------
kwin4_effect_zoom:
zoomFactor: 1.2
mousePointer: 0
mouseTracking: 0
enableFocusTracking: false
followFocus: true
focusDelay: 350
moveFactor: 20
targetZoom: 1

kwin4_effect_slidingpopups:
fadeInTime: 250
fadeOutTime: 250

kwin4_effect_coverswitch:
animationDuration: 200
animateSwitch: true
animateStart: true
animateStop: true
reflection: true
windowTitle: true
zPosition: 900
dynamicThumbnails: true
thumbnailWindows: 8
primaryTabBox: true
secondaryTabBox: false

kwin4_effect_minimizeanimation:

kwin4_effect_screenshot:

kwin4_effect_slide:

kwin4_effect_desktopgrid:
zoomDuration: 300
border: 10
desktopNameAlignment: 0
layoutMode: 0
customLayoutRows: 2
usePresentWindows: true

kwin4_effect_flipswitch:
tabBox: false
tabBoxAlternative: false
duration: 200
angle: 30
xPosition: 0.330000013113022
yPosition: 1
windowTitle: true

kwin4_effect_fade:

kwin4_effect_dialogparent:
changeTime: 300

kwin4_effect_highlightwindow:

kwin4_effect_taskbarthumbnail:

kwin4_effect_presentwindows:
layoutMode: 0
showCaptions: true
showIcons: true
doNotCloseWindows: false
ignoreMinimized: false
accuracy: 20
fillGaps: true
fadeDuration: 150
showPanel: false
leftButtonWindow: 1
rightButtonWindow: 2
middleButtonWindow: 0
leftButtonDesktop: 2
middleButtonDesktop: 0
rightButtonDesktop: 0
dragToClose: false

kwin4_effect_blur:
blurRadius: 8
cacheTexture: true

kwin4_effect_logout:
useBlur: true

kwin4_effect_dashboard:
brightness: 0.5
saturation: 0.5
blur: false

kwin4_effect_outline:

kwin4_effect_startupfeedback:

> Auroblack, FormaN, Air-Oxegen
Does it happen when switching between the (default, regular) Oxygen, Plastik and Laptop decoration?

>> Does it happen when switching between the (default, regular) Oxygen, Plastik and Laptop decoration?
No. It happen when I changing theme of windows between FormaN or Air-Oxygen or Auroblack and sometime with Oxygen.
PS: with Oxygen it happen no always.

I strongly assume this one's a dupe of bug #316033
See https://git.reviewboard.kde.org/r/109273/ - if you can, please apply the patch and confirm or deny that this is the same issue, thanks.

*** This bug has been marked as a duplicate of bug 316033 ***