Window title bars become unresponsive to dragging with mouse

[Rainer Rohde]

Note: I am testing Unity 7 right now.

When launching an app from the Launcher, and then dragging it against the Unity Panel to maximize, or against the left or the right screen border to half-size it, and then dragging it away from the respective position, upon the next click on the title-bar, the mouse can no longer drag the window, HOWEVER, there's an area right beneath the title-bar which now allows for dragging, but not the title-bar directly as expected.

Note: Because of this, the window can no longer be closed/minimized/maximized by clicking on the respective title-bar buttons on the left of each window.

It seems as if after resizing the window, the draggable area has moved down a few notches. All other functions of the window seem to work otherwise, except for the title-bar mouse interaction.

Current workaround - use ALT while dragging the window, or find area beneath the title-bar.

Note: When closing the app, and launching it again, it's reproducible using the steps described above.

This glitch seems to have started today...

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 6.12.0daily13.03.22.1ubuntu.unity.experimental.certified-0ubuntu1 [origin: LP-PPA-ubuntu-unity-experimental-prevalidation]
ProcVersionSignature: Ubuntu 3.8.0-8.17-generic 3.8.0
Uname: Linux 3.8.0-8-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CrashDB: unity
Date: Fri Mar 22 14:22:33 2013
EcryptfsInUse: Yes
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Colin Law (colin-law)]

This also happens if a window is maximised using the buttons rather than dragging to top panel, and then unmaximised.