It's not essential or anything, but on a Macintosh, you can't paste with [COMMAND]+[V] into signs. Pasting on Macs was fixed a while ago in the chat and in books, but you forgot signs!
Environment
MacBook Pro w/ Mac OS X 10.10, Minecraft 1.8.3
MC-78815
Cannot Paste Into Signs
Resolved
Invalid
0
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Pasting text into signs was never possible.