[Blender 3D]Sometiems, the Key is not working on a computer keyboard

While I am studying with my two sons in the blender 3d, we have to use the short key many times. 

 

Some days the key is not working. we faced these problems a lot recently. 

 

Then I searched this problem solving on Google. 

 

They said I might be pressed Korean language transfer Key.

 

So I tested then it worked and figured out.

 

FYI, Thanks guys~ 

 

This image from the apple site, I think this mac book pro is a global version. 

This is my mac book pro keyboard image. ( Korea version ).   In the left middle, you can see the language transfer key for Korean.