I use ata-pp5 theme with wordpress for my site,recently after i update my wordpress to3.5.1 now the drag and drop feature in the widget area is not working..,i already try add Google Libraries plugin but it also did't work,
Have you tried:
=> Deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).
=> Resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.
I think this may help you to resolve your problem.
Its because of some faulty plugins .. there is fix of this problem and its pretty easy way to follow . Here is the solution http://www.youtube.com/watch?v=1UY0u-aZb-k
来源：https://stackoverflow.com/questions/15358840/wordpress-widget-drag-and-drop-not-working-after-update-to-3-5-1