Unable to locate ending bracket for (ANY CODE HERE)

Basically, whenever, WHENEVER, I try to use a /give, /summon, or other command and I use a datatag IN A COMMAND BLOCK, it ALWAYS gives me the error "Unable to locate ending bracket for" and then some random bit of code!
This is what I typed in:

/give @p shears 1 0 {display:{Name:"Wrench"}}

I expected it to give me shears named, "Wrench".
Nope, it didn't do anything. The error message was, without the date:
"Data tag parsing failed: Unable to locate ending bracket for:

"
All that I need to do to reproduce it is just to type a command into a command block with datatags and activate it with redstone!

Strangely, whenever I COPY AND PASTE code into the box, it works. But as soon as I make a change, it breaks again. I believe, but am not close to sure, that it has to do with the block's orientation...?