Reset the Wordpress Thesis 2.0 Classic skin

Thesis 2.0.1 includes a more extensive skin manager (located via the Manager tab in the Skin Editor), which allows you to backup skin states and reset a skin to its default settings

In Thesis 2.0  you’re trying to figure out what is going on and completely messed up the classic skin?

find custom.php in wp-content/thesis/skins/thesis-blank/

1. delete_option( 'thesis_classic_css_custom' );
   delete_option( 'thesis_classic_css' );
   delete_option( 'thesis_classic_vars' );
   delete_option( 'thesis_classic_snippets' );
   delete_option( 'thesis_classic_packages' );
   delete_option( 'thesis_classic_templates' );
   delete_option( 'thesis_classic_boxes' );
   update_option( 'thesis_raw_css','' );

2. Reload your home page (it should be blank unless you’ve played with adding HTML to the blank skin)
3. Reactivate the Thesis Classic skin
4. Save and Compile CSS in the skin editor 
5. Delete the code from step 2.

Ref: http://www.kristarella.com/2012/10/reset-thesis-2-classic-skin/