Red (close) button becomes dark and windows does not close

Sometimes when I click the red (close window) button, it becomes darker and the window does not close, and the app seems inactive. I have to click the title bar (sometimes many times, the lag time to ) and the windows can close, or it can come back with the red button "normal". Very annoying when I have to close many specific windows as it completely breaks the flow of activities.
Mail seems to be a application where it happens often, but it happens also with safari, omnifocus...
Any idea how to fix this?
I use a trakpad/MBA mid 2011 OS X 10.9.4
Thanks,
Albi.

The problem is the same with Commnd-V, of course.
Here is how the button looks like,
I noticed it happens mainly when one application is active and I try to close a window which is not active.
AR

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Error code 43 with message 'one of the USB device attached to this computer has malfunctioned, and Windows does not recognise it'.

i have suddenly got this message 'one of the USB device attached to this computer has malfunctioned, and Windows does not recognise it'. it says error code 43. the usb drives (2 in no.) have stopped working as in they dont recognise the external hard drive
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Hi ameet2005,
Please check if the following suggestions help:
First, please disconnect all USB devices and then perform the following steps:
1. Click "Start" button, type “devmgmt.msc” (without quotation marks) in the “Search” bar and press "Enter". Click “Continue”
if necessary.
2. In Device Manager, double click to expand "Universal Serial Bus controllers", right click on the Host Controller, click "Uninstall" and click "OK".
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Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”

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Uninstall your USB drivers in your computer & reinstall.
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Love Kudos! If you feel my post has helped you please click the White Kudos! Star just below my name : )
If you feel my answer has fixed your problem please click 'Mark As Solution' and make it easier for others to find help quickly : )
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One of the usb devices attached to this computer has malfunctioned, and Windows does not recognize it. For assistance in solving this problem, click this message.

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http://support.apple.com/kb/HT1923
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Here:
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Hey everyone,
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Red (close) button becomes dark and windows does not close

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