It occurs on Kubuntu 14.04 and Kubuntu 14.10 also
When I tried to modify tilda to be Tranperant or Translucent
It didn't work
please see the screenshot
It happened to be created box in the middle of the tilda
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-38.65-generic 3.13.11.8
Uname: Linux 3.13.0-38-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: i386
CurrentDesktop: KDE
Date: Thu Oct 23 05:55:20 2014
InstallationDate: Installed on 2014-10-22 (0 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.1)
ProcEnviron:
LANGUAGE=ko
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=ko_KR.UTF-8
SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
Also, There left blurr image of other windows which are overlapped while open.
Here is another screenshot.