Public bug reported:

Kubuntu 18.04 64bits
GTX 960
==
$ uname -a
Linux yafu 4.15.0-12-generic #13-Ubuntu SMP Thu Mar 8 06:24:47 UTC 2018 x86_64 
x86_64 x86_64 GNU/Linux
==
$ sudo dpkg -l | grep -i nvid

ii libnvidia-cfg1-390:amd64 390.42-0ubuntu1 amd64 NVIDIA binary OpenGL/GLX 
configuration library
ii libnvidia-common-390 390.42-0ubuntu1 all Shared files used by the NVIDIA 
libraries
ii libnvidia-compute-390:amd64 390.42-0ubuntu1 amd64 NVIDIA libcompute package
ii libnvidia-compute-390:i386 390.42-0ubuntu1 i386 NVIDIA libcompute package
ii libnvidia-decode-390:amd64 390.42-0ubuntu1 amd64 NVIDIA Video Decoding 
runtime libraries
ii libnvidia-decode-390:i386 390.42-0ubuntu1 i386 NVIDIA Video Decoding runtime 
libraries
ii libnvidia-encode-390:amd64 390.42-0ubuntu1 amd64 NVENC Video Encoding 
runtime library
ii libnvidia-encode-390:i386 390.42-0ubuntu1 i386 NVENC Video Encoding runtime 
library
ii libnvidia-fbc1-390:amd64 390.42-0ubuntu1 amd64 NVIDIA OpenGL-based 
Framebuffer Capture runtime library
ii libnvidia-fbc1-390:i386 390.42-0ubuntu1 i386 NVIDIA OpenGL-based Framebuffer 
Capture runtime library
ii libnvidia-gl-390:amd64 390.42-0ubuntu1 amd64 NVIDIA OpenGL/GLX/EGL/GLES 
GLVND libraries and Vulkan ICD
ii libnvidia-gl-390:i386 390.42-0ubuntu1 i386 NVIDIA OpenGL/GLX/EGL/GLES GLVND 
libraries and Vulkan ICD
ii libnvidia-ifr1-390:amd64 390.42-0ubuntu1 amd64 NVIDIA OpenGL-based Inband 
Frame Readback runtime library
ii libnvidia-ifr1-390:i386 390.42-0ubuntu1 i386 NVIDIA OpenGL-based Inband 
Frame Readback runtime library
ii nvidia-compute-390 390.42-0ubuntu1 amd64 NVIDIA computing metapackage
ii nvidia-compute-no-dkms-390 390.42-0ubuntu1 amd64 NVIDIA computing 
metapackage - no DKMS
ii nvidia-compute-utils-390 390.42-0ubuntu1 amd64 NVIDIA compute utilities
ii nvidia-dkms-390 390.42-0ubuntu1 amd64 NVIDIA DKMS package
ii nvidia-driver-390 390.42-0ubuntu1 amd64 NVIDIA driver metapackage
ii nvidia-kernel-source-390 390.42-0ubuntu1 amd64 NVIDIA kernel source package
ii nvidia-prime 0.8.6 all Tools to enable NVIDIA's Prime
ii nvidia-settings 390.42-0ubuntu1 amd64 Tool for configuring the NVIDIA 
graphics driver
ii nvidia-utils-390 390.42-0ubuntu1 amd64 NVIDIA driver support binaries
ii xserver-xorg-video-nvidia-390 390.42-0ubuntu1 amd64 NVIDIA binary Xorg driver
==============
=====

Hello.
Approximately a week ago, an update introduced this problem (I'm not sure if 
KWin or NVIDIA proprietary driver update).
With Brisa window decorator, the title bar on top for some windows starts 
blinking annoyingly, switching between full transparency and opacity. When it 
is full transparent, it shows desktop Wallpaper from behind. If I disable 
composition with Shift + Alt + F12, the blink disappears. Anyway with the 
composition disabled other problems appear, as some windows do not appear in 
task manager in panel, or plasmoid activity pager does not change between 
activities.
Apparently the problem does not happen with other window decorators downloaded 
from the internet, anyway it does not seem like a good option because they are 
not at all configurable as is Brisa window decorator.

I have Kubuntu 18.04 currently updated. The updates that I think could be 
responsible for the problem, maybe are:
http://pasteall.org/893926

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

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https://bugs.launchpad.net/bugs/1758726

Title:
  [Kubuntu 18.04] Blinks in title bar of the Brisa window decorator

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