After running Win 7 for some unknown period of time, the taskbar icon highlight starts to stick (video demo here: http://screencast.com/t/l5LhJ2uM). If I restart or kill explorer.exe and relaunch, it goes away.
Any idea what might be causing this?
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It seems that few people on the Internet have any knowledge of accessibility because any search for this issue brings only up the ⇧ Shift+right-click trick. For numerous reasons, it is not always possible to use the keyboard and mouse at the same time. Here is how you can accomplish it with just the mouse and just the keyboard:
With only the mouse, right-click one of the taskbar buttons, left-click a button, wait for the Aero Preview window to pop up over the button, right-click it to open the context-menu, then click somewhere else to dismiss the menu.
With just the keyboard, hold the ⊞ Win key and press a number corresponding to one of the taskbar buttons—e.g., ⊞ Win+1 to access the first button. (Alternately, you can press ⊞ Win+T to focus the taskbar, then Tab to the first button.) Now you can press the ▤ Apps/Context key to open the context-menu, then Esc to dismiss it.
Regardless, this is still only a temporary fix and the problem usually returns fairly quickly. In my experience, it only takes a couple of window restores/minimizes to trigger the sticking again (sometimes it happens every few seconds).
I am glad I am not the only one, but hey low priority sure it wont block or break anything, just one of the main new features of Windows 7: the taskbar aero preview, which can be very useful sometimes for some application that use this feature. :-(
Another workaround is to move one of the taskbar icon (left clic) slightly and then hover another icon to restore the aero preview but it doesnt stick and the bug unfortunately comes back.
I have been having the same problem but I may have inadvertently fixed it. I believe it is connected to windows live. So if you use hot mail you will be having this problem. I have solved it by making sure I sign into windows live then signing into my mail. If I take a short cut the bar sticks. The other way is when it is stuck remove it and set it to come up on the left or right and side. Then when it is doing that remove it back to the bottom and click auto hide and save and it should stay hidden. I have been following this routine for the last two weeks and it this has been working fine.