Are you playing on a server? Do you know if it's updated with the last version? You can play with a 1.8.1 client on a 1.8 server, but the server will crash if you try to shift click items into a full chest or inventory.
That's the only thing I can think of that might happen to you. Ask the server administrator if the server has been updated.
If you're talking about shift-clicking for quicker crafting... thats been addressed by a person already. It works fine, there is something wrong with your end or you're just not doing something right, and judging by how you've been responding thats probably the most likely case.
Calm down, just press the left shift button slowly, and try both mouse buttons. See what happens.
P.S (UR NO HELP)
That's the only thing I can think of that might happen to you. Ask the server administrator if the server has been updated.
We are help, actually, you're just not giving us any information other than the fact that you don't know where the shift key is.
Calm down, just press the left shift button slowly, and try both mouse buttons. See what happens.
Don't hurt yourself now.