I can't seem to copy and paste commands into my command block

Whenever I try to copy and paste a long command into a command block, it seems to work, but then when I click "done," and then go back into the command block, the command is erased. I don't know what I am doing wrong!
Best Answer
1.8 seems to have an issue with copying and pasting from what I have noticed. I can't even paste into the chat bar...
I would recommend to just take the time and write out the command, besides you will get practice and be able to write it without copying it from a website.
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How do you copy and paste commands into command blocks?
Due to the power of the command blocks, there are a few conditions that need to be met in order to use them in your server. First, you will need to enable command blocks directly in the server settings. Secondly, you will need to be OP on the server and in creative mode to be able to place the block.Nas - I Can (Official HD Video)
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Answer 2
Are you sure you are hitting "Done" and not "Cancel"? 1.8 does have a few problems copying and pasting, but 1.8.1 and up should be fine.
Answer 3
How exactly are you doing it? I'll show you how I do it.
Grab a command block, and place it down. Open it up, and do CTRL+V to paste it in the command block. Click DONE, make sure not to click close.
Are you on a multiplayer server? If you are make sure command blocks are ON because if they are not, it will not work.
Also do you have cheats on, or have OP on the server? If you don't, it wont work either.
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