Public bug reported:

I cannot reproduce it but it seems to me it is triggered when I open a "file 
selection" widget.
I canno switch between windows with ALT+TAB, I cannot iconize or resize windows 
(no window widgets and handles).
If I am lucky I can use the "K" button to logout e log back in.
I am available to help troubleshooting provided that precise directions are 
provided.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: kwin-x11 4:5.5.5-0ubuntu1
Uname: Linux 4.4.10-040410-lowlatency x86_64
NonfreeKernelModules: nls_iso8859_1 8812au cfg80211 pci_stub vboxpci vboxnetadp 
vboxnetflt vboxdrv rfcomm bnep btusb btrtl btbcm btintel xt_multiport 
iptable_filter ip_tables x_tables ath3k bluetooth input_leds hp_wmi intel_rapl 
snd_hda_codec_realtek sparse_keymap x86_pkg_temp_thermal snd_hda_codec_generic 
intel_powerclamp coretemp kvm_intel snd_hda_intel kvm snd_hda_codec irqbypass 
snd_hda_core crct10dif_pclmul snd_hwdep crc32_pclmul snd_pcm aesni_intel 
snd_seq_midi aes_x86_64 snd_seq_midi_event lrw snd_rawmidi gf128mul glue_helper 
snd_seq ablk_helper cryptd snd_seq_device snd_timer serio_raw snd mei_me mei 
soundcore lpc_ich shpchp 8250_fintek mac_hid parport_pc ppdev lp parport 
autofs4 xfs uas usb_storage raid10 raid456 async_raid6_recov async_memcpy 
async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 multipath linear 
hid_generic usbhid hid raid0 i915 i2c_algo_bit drm_kms_helper syscopyarea 
sysfillrect sysimgblt psmouse ahci fb_sys_fops r8169 libahci drm mii wmi fjes 
video
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: KDE
Date: Mon May 16 15:56:26 2016
InstallationDate: Installed on 2016-04-22 (23 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: kwin
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: kwin (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages xenial

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https://bugs.launchpad.net/bugs/1582246

Title:
  Randomly I am left without windows decoration and other window-related
  function

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