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Pls see the attached image, seem to me that I press a key combination that put numbers in my launch bar and not allow it to hide. How can I restore my default launch bar behavior and remove those numbers and letters ('s' and 't')?enter image description here

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Its sounds like sticky keys got turned on. Follow these steps to turn it off.

To check open 'System Settings' enter image description here
Then open 'Universal Access' enter image description here
Switch to the 'Typing' tab and turn 'Sticky Keys' off (if its on) enter image description here

Hopefully this will fix your problem.

NOTE:
You might have to press several keys, like CTRL and Super after you turn sticky keys off.

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I did something, not know what, and all go to the normality ;) Seem to me that I open and maximized an application. Still, what is it all about sticky keys? –  gsc-frank Dec 20 '12 at 3:54
    
Sticky keys makes a function key act like you are pressing it unil you press it again. If you turned this on (maybe by accident) it will show the numbers until you press 'Super' or open the dash. Try pressing 'Super' and let me know if the numbers appear again. –  Seth Dec 20 '12 at 4:11
    
Thanks @iSeth. I have sticky key off, so how I get there? and more important, how can I out from that state? cos I really don't know how I out to from that odd launch bar, I this is not the first time this happen to me :( –  gsc-frank Dec 20 '12 at 5:35
    
Have you restarted the computer latly? –  Seth Dec 20 '12 at 14:40
    
Yes. But the problem go away without restart the laptop. I think that was a combination of keys that I press or something like that, but I really can't figure out what keys each time this happen to me I pressed. That thing happen to me about one time per month or something. –  gsc-frank Dec 20 '12 at 18:06
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