I am using Microsoft SQL Server Management Studio version 12.0.4100.1 (SSMS 2014). I had the same problem and resolved it by following these steps -
Click "Tools â Options." In the Options window, expand Environment â Keyboard â Keyboard. Then, in the right sidebar, click the "Reset" button.

Sandy Jan 11 '17 at 15:39 2017-01-11 15:39
source share