Taskbar misses mouse-leaving event; icon glow and thumbnails become stuck RRS feed

  • Question

  • This glitch is a "state effect," meaning you will not experience it at all until the state (whatever that may be) is triggered. It occurs randomly and remains in effect until explorer.exe is restarted by one means or another. I have not found a reproduction pattern yet.

    Occasionally, the glow/thumbnail on taskbar icons will become "stuck".

    Usually, when you move the mouse off of a taskbar icon, the glow and thumbnail will dissipate. In this case, the taskbar doesn't realize the mouse has left the icon, so the glow remains. It will even remain if you move the mouse off of the last icon to an empty area of the taskbar. If you move the mouse off of a pinned, non-running icon, its indicator underneath will remain as well.

    Everything is processed correctly, however, if the mouse is moved from one icon to another--so only one icon will be glowing or have a thumbnail at a time--but once the mouse leaves the last icon, the glow will be stuck and a thumbnail will soon show up, because Windows thinks the mouse is still over the icon.

    The taskbar thumbnails seem to use another window, however, so if you move the mouse onto and off of a thumbnail, the mouse-leave event will register properly.

    This occurs using Windows 7 x64 Ultimate, but I have seen it happen randomly on machines with Intel integrated graphics and my own which have NVIDIA graphics chipsets. It has nothing to do with the video driver. Enabling or disabling Aero has no effect.

    It's a shame that explorer.exe has to be restarted, because some system tray icons don't return after doing that...

    Monday, April 26, 2010 11:43 PM


  • Hi Twizzlerite,


    Please check if the issue occurs in Clean Boot. If the issue disappears in the Clean Boot environment, you can continue to narrow down which entry is causing the issue.


    Also, use ShellExView to disable third party extension of Windows Explorer to check the result:


    1. Download ShellExView v1.41 from the following link http://www.nirsoft.net/utils/shexview.zip


    Please Note: The third-party product discussed here is manufactured by a company that is independent of Microsoft. We make no warranty, implied or otherwise, regarding this product's performance or reliability.


    2. Right-click the "shexview.zip" file, select "Extract All", the Extraction Wizard will prompt.

    3. Click Next, input "C:\ShellExView" (without the quotation marks) in the "Files will be extracted to this directory" textbox.

    4. Click Next and click Finnish.

    5. Open the "C:\ShellExView" folder and double-click the "shexview.exe" file. It will scan the registry for all the shell extensions.

    6. Select all the non-Microsoft extensions in pink by press "Ctrl" in the keyboard.

    7. Click the "Disable Selected Items" on the toolbar and click Yes.

    8. Restart your computer and check if the issue is resolved.


    If the issue persists, create a new user account to see if the issue occurs.





    • Marked as answer by Linda Yan Monday, May 3, 2010 2:43 AM
    Thursday, April 29, 2010 5:51 AM