Windows stacking (foreground/background) gets completely screwed up

[Teo]

I have reported several issues (none of which got the slightest attention, by the way) but I now realize they ALWAYS happen all together, so they are most surely just consequences of one same issue.

At random times it happens that the front/back or in-front/behind relation between windows becomes badly screwed up in several ways:
1 - windows are on top of Launcher while Launcher should always be the topmost
1b - even the context menu of Launcher icons that appear by right-clicking on them turns out to be behind maximized windows (or non maximized windows)
2 - the window-switching selector that shows up when you hit Alt+Tab is on the background (hence invisible most of the time unless you minimize all windows or show desktop)
3 - Fullscreen content from any browser, such as for example fullscreen of video or flash content, goes fullscreen on the background instead of on the foreground; even clicking on it (if some portion of it is visible behind the foremost windows) doesn't bring to the foreground, the only workaround (which was difficult to figure out) being: ctrl+super+d and then click on the browser launcher icon.

Sometimes (3) is slightly different, in that the fullscreen content stays on top of everything except Launcher.

All of this is very annoying and this issue has been around for a very long time, certainly more than a year (i.e. two releases) if not forever. This cripples the usability of the whole system to the point that one is forced to restart, which is painful. This should be high priority.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.2+14.04.20140714-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Sun Nov 9 12:46:03 2014
InstallationDate: Installed on 2013-10-11 (393 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: unity
UpgradeStatus: Upgraded to trusty on 2014-05-24 (168 days ago)