in game bug

i cant shift click and if i click on a object in by inventory it doesn't stick to my cursor i have to drag and drop everything it takes ages and if i want 1 thing out of a stack of things i have to half the stack like 6 times until i get one of that item it has been happening since i got the update yesterday i play online aswell and none of my friends have the same problem ive deleted minecraft and downloaded it 3 times but it doesn't seem to sort the problem its starting to annoy me now can you get back to me asap please as it is making me not want to play minecraft even though i love to play it and my minecraft actually crashed yesterday