Why does Brackets disable the arrow keys and the backspace key?

Question

css

Brackets disables the arrow keys and the backspace key. Before that, everything was fine, I did not climb in the settings. After restarting everything is fine again. After a while the keys don't work again. Save. What to do?

Answer 1

Emmet has been disabled in Brackets for a month already (even there are no Emmet tabs in the menu), reinstallations do not help. So I'm joining.

Answer 2

Maybe the window is losing focus?

Answer 3

I understand that reinstallation is not an option, but it helped :)
otherwise, I could not solve the problem :(