The first sign you set down does not let you type on multiple lines
STEPS TO REPRODUCE:
Load a world
Set down a sign
Type something
Press enter
Type something else
RESULT:
Everything is on the same line, though the text entry cursor flickers to what should be the correct position.
EXPECTED RESULT:
Text is on multiple lines.
EDIT: It appears the controller was not even part of the issue.
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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