Can't use drag&drop

Hello, I'm using MacBook Pro (retina, 15", late 2013, 2,3 GHz Intel core i7) and after using for a while happened smh strange. I can't use drag&drop, so I can't select the object and drag it. What is wrong?

Hello!
I wonder, does the issue persist even after a simple restart of OS X?
If so, please start Disk Utility (it's in your Applications>Utilities folder), click on your harddrive and select [repair disk permissions]

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    We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
    Click
    HERE to participate the survey.
    Dear Barry Wang thank you so much for your kind support ,just open me a way to do it ,you can see in this post https://social.msdn.microsoft.com/Forums/vstudio/en-US/55873851-e86c-4a20-9b00-de3419054ba8/get-stuck-to-dragdrop-in-this-case?forum=wpf .
    Wish you a Happy New Year .
    Sincerley

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