Based on a couple other UIs that I've seen and adapted them to fit my needs.
READ THE README! ![Smile](//cdn-wow.mmoui.com/images/style_mmoi_wowi2/smilies/smile.gif)
Also, check your keybindings for things like:
Show/Hide Minimap
GoGoMount
Bartender
etc.
EDIT 10-31:
Yes. I found out that I hadn't placed the class bar or the pet action bar. I suppose that's what I get for only testing the UI on a priest and a shaman. This will be resolved in the next release (within the next couple days, I hope).