So, I was gone for a couple of days and I installed the new patch last night.
However, when I logged on this afternoon, I kept getting the error message:

"Interface\FrameXML\ChatFrame.lua:1256:bad argument #2 to "strsplit' (string expected, got nil)"

The odd part is, I have absolutely no mods enabled on this character (or any, for that matter), and when I go on my low level alt, the error message doesn't appear. I can even enable the addons, and the message still doesnt appear.

Any help would be great, thanks!

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The Bible says thou shall not kill.
But hear this,
%@@#. That. #**!.

This is fixed for 2.1.2, just add a ; to the end of your /castsequence lines that have conditionals.