Minecraft say's to me [18:21:53] Invalid json: malformed JSON at line 1 column 3
Linked issues
Comments 4

Please provide the exact command used.
http://minecraft.gamepedia.com/Commands#title
title (subtitle and title mode only)
Specifies the text to display as a title or subtitle. Must be valid raw JSON text (for example, {"text":"Chapter I","bold":true}).
works for me.
looks like MC-83460, you require quotes around both the key's and their values now
Please do not mark unreleased versions as affected.
You don't have access to them yet.