I can't punch in minecraft windows 10

When I installed the new 1.1 update I was looking at the new things then I made a new world then I couldnt punch its only punching when i went to the menu i could click things so i knew it wasnt my mouse but i could do everything else normally its just the punching so i deleted the world and madde a new world but still i couldnt punch but i could do everything else normally. so please help.