flashing in front of a not responding app

[Fusion]

1) ubuntu 12.10 (fresh install)
2) (translated from my language)
dash:
  Installed: 0.5.7-3ubuntu1
  Suggested: 0.5.7-3ubuntu1
  Edition matrix:
 *** 0.5.7-3ubuntu1 0
        500 http://gr.archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages
        100 /var/lib/dpkg/status

3) ----------- what i expected to happen -------------------
open dash normal as it opens without any window behind it

4) --------------what happens -------------------
happens: when an app is not responding and dash opened at the front.
where happens: at the part of dash that overlays the not responding app
what happens: dash has this part flashing fast while the not responding application is behind
details: 1. flashes only the part of dash in front of the app
              2. if you move the app out of the backward dash stop flashes (opens normal)
              3. if you move the app to another position backward the position that dash opens, then the new part of dash is flashing
              4. if not responding app goes full screen, dash opens normal
              5. flash: in every case i meant (if my english were bad) with flashing that the part of dash shows and hides extremely fast.. annoying enough to press escape.

5) i hope that helps

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: dash 0.5.7-3ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
Date: Mon Oct 22 13:41:56 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
SourcePackage: dash
UpgradeStatus: No upgrade log present (probably fresh install)