UPDATE: A similar bug has also been found in Windows 7. More details are given at the end of this topic.
This is the first bug found in Microsoft's upcoming OS Windows 8. Thanks to AskVG reader "Uewd" for finding and sharing it with us.
Let us tell you it's not a big bug. It doesn't cause any noticeable problem but at the end it's a bug so it must be fixed by Windows team in the RTM version of Windows 8.
This bug appears while right-clicking on Taskbar in a certain condition. Following are the steps to re-create it:
1. First right-click on a pinned item in Windows 8 Taskbar or right-click on a running program's button in Taskbar. It'll open the jumplist for that program.
2. Now right-click on empty area in Taskbar and get ready to see the bug.
3. The context menu (right-click menu) will appear behind the Taskbar and some part of the context menu will hide behind the Taskbar as shown in following screenshot:

The most interesting thing is that you'll be able to click on that hidden part. Once you exit from the context menu, it leaves a white mark in Taskbar which can be removed by refreshing the Desktop.
This thing doesn't happen in any previous Windows version and we hope Microsoft will fix it in Windows 8 RTM version.
Following video demonstrates the whole bug live in action:
UPDATE: Windows 7 also contains a similar bug. The difference is that you'll need to right-click on Start ORB instead of Taskbar in 2nd step. You can watch following video to see this bug live in action:
Thanks to AskVG reader "Michael Crabtree" for sharing it...
Posted by: Vishal Gupta | Categories: Windows 7, Windows 8
Mohammed Fakhruddin
Actually this is not a bug as it does not happen on my computer. As well as the other 3 computers running windows 8 consumer preview. I think Microsoft has fixed the issue with an update because i do remember updating my computer yesterday.
ABHINAY
i donn't think so........no bug i can find.....
VG
Its definitely a bug as I can reproduce it every time. I also checked it in my other computers. It might be possible that it only exists in 64-bit edition of Windows 8?
Also if Microsoft fixed it via an update, its really great to see. :)
Kapil Arya
Well folks, I've also something to share you.
That is the drive tile bug, when you add all the drives to start screen tiles, you'll see the tiles with numbers instead of drive letter. Go check it.
Anyway nice find Vishal !
Norbert Gostischa
Sorry but I can't reproduce this one either.
Mohammed Fakhruddin
No i have three computers in my house running windows 8 two of them run 64bit so either the issue is been fixed or idk
xpclient
Easily reproducible. All updates applied for Windows 8 CP. I didn't notice it until now because I was running a custom AutoHotkey to disable the jump list and instead always show the context menu on right clicking a pinned or running app. Then the bug doesn't occur.
Arindel
Something similar happens in Windows7 as well. Right click a pinned then right click taskbar, The context menu stays there no matter what until you click on it.
ABHINAY
no @VG i tried but i don't see the bug
ABHINAY
i m using 32-bit system..i don't find the bug
John P
It did not happen !!
Sukhpreet Singh
Hey Vishal , i Found another in windows 8 cp . . .
Their are 2 task manager in windows 8
1 :- Windows 7 style task manager in windows 8 cp :-
C:\Windows\System32\taskmgr.exe
2:- Windows 8 task manager in windows 8 cp
%windir%\system32\taskmgr.exe /7
execute these commands in windows run
Similarlily Windows Mobility Center :-
C:\Windows\system32\mblctr.exe
Randy Collins
There doesn't seem to be any bug
NZero
Creating the Windows 8 user experience blogs.msdn.com/b/b8/archive/2012/05/18/creating-the-windows-8-user-experience.aspx
Here are the relevant parts in which Mr. Jensen Harris describes the coming changes:
“We applied the principles of ‘clean and crisp’ when updating window and taskbar chrome. Gone are the glass and reflections. We squared off the edges of windows and the taskbar. We removed all the glows and gradients found on buttons within the chrome. We made the appearance of windows crisper by removing unnecessary shadows and transparency. The default window chrome is white, creating an airy and premium look. The taskbar continues to blend into the desktop wallpaper, but appears less complicated overall.
To complete the story, we updated the appearance of most common controls, such as buttons, check boxes, sliders, and the Ribbon. We squared off the rounded edges, cleaned away gradients, and flattened the control backgrounds to align with our chrome changes. We also tweaked the colors to make them feel more modern and neutral.”
Windows 8 will not featuring Aero, anymore!
Read more:winsupersite.com/article/windows8/windows-8-release-preview-rip-aero-20032012-143133