Public bug reported:

Periodically, and for no predictable reason, Ubuntu will start to ignore
mouse clicks in certain situations.  The following seem to fail when the
condition is active:

clicking title bars.
clicking close, maximize, or minimize.
mousing into the menu bar at the top of the screen produces no menu bar, and 
does not respond to clicks
the launcher on the left no longer produces information on mouseover, nor does 
it respond to clicks

The following seems to continue to work when the condition is active:

clicking in text input fields within applications
keyboard

I can generally clear the condition by flailing around with alt-enter or
by changing to a text console (alt-F1) and back to X.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.19.0-30-generic 3.19.0-30.34~14.04.1
ProcVersionSignature: Ubuntu 3.19.0-30.34~14.04.1-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.16
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Oct 20 18:13:40 2015
InstallationDate: Installed on 2015-10-19 (1 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: linux-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-lts-vivid (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1508267

Title:
  Mouse randomly fails to click menu bars, launcher, and title bar

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