I was playing around in Unity 2D, and I messed up my configuration. How can I reset it, preferably without losing other config files? (such as Empathy config, Firefox/Chrome config, etc)
As you said in the comment in Adam's Thompson answer , Unity 2D uses metacity.
So , did you try
in terminal ?
Open a terminal and type
to reset Unity 2D to defaults, or IMPORTANT - THIS RESETS EVERYTHING NOT JUST UNITY-2D
to reset Unity (3D).
If default Ubuntu Nautilus theme is also missing, close all instances and type
To reset unity type the following in the terminal:
To reset the unity icons type:
To reset Compiz type (NOTE: this will reset ALL compiz settings):
The above command will reset the respective elements back to their default configuration.