Close button unreachable in window

[Diogo Baeder]

Hi,

I'm not really sure of what triggers this behaviour, but, after some time using a Ubuntu session, the window buttons (close, minimize, maximize) are unreachable and unclickable - if I focus my mouse cursor over them, they get hidden, and the window title shows up in front of them, as if I wasn't hovering the window bar -. This only happens if I hover the cursor on the corner of the window, however the window menu and buttons are shown if I hover the menu options themselves.

A video with a demonstration of me reproducing this bug can be found here:
http://ubuntuone.com/66peoJXeRekgsE6LzkDgvG
Notice how, exactly when I hover the upper left corner, they are replaced by the window title.

This doesn't happen right in the start of the session; For instance, if I restart my user session, they get back to working properly, but there seems to be some application that somehow triggers this behaviour. (One that I'm a bit suspected of is Choqok, as it's a KDE application, and which I use in a regular basis.)

Here are my specs:
Description: Ubuntu 13.04
Release: 13.04

Any ideas of what that might be?

Cheers,

Diogo

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
Uname: Linux 3.8.0-21-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Sat May 18 13:41:37 2013
InstallationDate: Installed on 2012-12-02 (166 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
SourcePackage: unity
UpgradeStatus: Upgraded to raring on 2013-04-28 (20 days ago)

[Diogo Baeder (diogobaeder)]

Update: I think I've been able to work around this issue; it seems that, after closing Steam (via "Exit" from the icons tray), the buttons got reachable/clickable again. As soon as I got them problematic again, hence reproducing this bug, I'll see if Steam is running, and, if so, I'll close it and see again if this brings my buttons back.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[snapy (sdfjsfjaei-hans)]

I currently have this bug in 14.04 LTS. :(
Hope you can find the bug and fix it.