Reseting to default after MoveEverything addon

If you right click on the target of target frame you should be able to unlock it and move it to wherever you like. (I'm assuming you're not using any other type of party/raid frames).

In terms of the chat bubble, if you mouse over the chat tab you should be able to right click on the tab and select unlock. After that you can re-size the window by using the bottom right hand corner of the window.

To reset the size of your chat window in WoW you can simply right click you main chat tab and bring up the options and reset them. There is a safe that says this will remove all customization you have to click yes and it will be back to the way it is when you first install WoW. Not sure how to fix your target of a target, but hope this helps.

You can reset to the default UI by deleting your "WTF" folder in the World of Warcraft programs directory. The folder will automatically regenerate the next time you launch the game.

The folder contains all custom settings, so you will be reset to the base game. Anything stored on the server will be preserved (including macros).