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This bug is still not solved by KDE yet. It happens lot of time but config again and again is really annoying & irritating even time consuming as well. But today I found quickest way to get your thing's back which you lost somehow......

  Just hit ALT+F2 and type ksysguard. Open it, then look for Kwin_x11 Right click on it, then click on "send signal" and click on "Interrupt(INT)". Within 5-10 seconds the display will turn black and it Will resume on login session as soon as you login panel(s), wallpaper, etc... will be back to life... I mean Whatever configuration you did last before the problem occurred, you brought it back as it is.

I know this post is really really old but today also still this bug not solved by KDE. It happens lot of time but cofig again and again is really annoying & irritating but today I found the quickest & easiest solution for it. Just hit ALT+F2 and type "ksysguard" , Open it then find "Kwin_x11" right click on it then click on send signal and final step is click on Interrupt(INT) within 5-10 Seconds display will it turn black and you will return in login section as soon as you login. Panel(s), Wallpaper etc... everything back on track..... I mean whatever configuration is in use you brought it back as it was exactly before this problem appeared. I am not sure about the application you are using that session will recover or not. Because this happen with me while doing System update so please anyone use this method and your application session restore or not update give us an update if in case station not been restore and somehow you restored it let us know how you did that thanks in advance "help for help"

My first post on superuser.

This bug is still not solved by KDE. It happens lot of time but config again and again is really annoying & irritating

Just hit ALT+F2 and type ksysguard. Open it, then look for Kwin_x11and. Right click on it, then click on "send signal" and click on "Interrupt(INT)". Within 5-10 seconds the system will reboot and panel(s), wallpaper, etc. will be back on track. Whatever configuration you did last before this problem occurred, you got it back.

This bug is still not solved by KDE yet. It happens lot of time but config again and again is really annoying & irritating even time consuming as well. But today I found quickest way to get your thing's back which you lost somehow......

Just hit ALT+F2 and type ksysguard. Open it, then look for Kwin_x11 Right click on it, then click on "send signal" and click on "Interrupt(INT)". Within 5-10 seconds the display will turn black and it Will resume on login session as soon as you login panel(s), wallpaper, etc... will be back to life... I mean Whatever configuration you did last before the problem occurred, you brought it back as it is.

I know this post is really really old but today also still bug not solved by KDE. It happens lot of time but cofig again and again is really annoying & irritating but today I found the quick easiest solution for it. Just hit ALT+F2 and type ksysguard and open it then look for Kwin_x11and right click on it then click on send signal and final step it click on Interrupt(INT) within 5-10 Seconds system will reboot and panel  (s) wallpaper etc everything back to track..... I mean whatever configuration last you did before this problem occurs you got it back in life.

My first post on superuser.

This bug is still not solved by KDE. It happens lot of time but config again and again is really annoying & irritating 

Just hit ALT+F2 and type ksysguard. Open it, then look for Kwin_x11and. Right click on it, then click on "send signal" and click on "Interrupt(INT)". Within 5-10 seconds the system will reboot and panel(s), wallpaper, etc. will be back on track. Whatever configuration you did last before this problem occurred, you got it back.