Double click didn't work. :( / shortcut key is very slow

Double click didn’t work. :frowning:
and shortcut key is very slow.

I’m using UE4 ver.4.15
And, I’m following your tutorials.
When I use a blueprint tool, I know that I can’t use ‘double click’.
So, I didn’t follow tutorial more. (moving glass door)

Also, I want to make movie.
So, I made Cinematics and… Master - Shot_01 ( like tutorial)
and, I want to edit Shot_01. So, I double clicked Shot_01. But Double click didn’t work. So, I can’t edit movie more…

What should I do?