Problem
I tried a few examples from Dinnerbone's gist using /rellraw. They may be outdated, however it should not crash clients.
Fix
By looking at the source, i think that "using" has been changed to "with". Again, the client should drop this message (eventually log it), but should not crash.
Examples
Causes all clients to crash:
/tellraw @a {"color": "yellow","translate": "multiplayer.player.joined","using": ["Dinnerbone"]}
works:
/tellraw @a {"color": "yellow","translate": "multiplayer.player.joined","with": ["Dinnerbone"]}
Incomplete without crash report (
[minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt
). Please attach it so that we can diagnose your issue.