=== modified file 'includes/common.inc'
--- includes/common.inc	2009-10-02 00:50:45 +0000
+++ includes/common.inc	2009-10-03 17:55:43 +0000
@@ -2853,7 +2853,7 @@ function drupal_get_css($css = NULL) {
     $css = drupal_add_css();
   }
 
-  $preprocess_css = (variable_get('preprocess_css', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
+  $preprocess_css = (variable_get('preprocess_css', 1) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
   $directory = file_directory_path('public');
   $is_writable = is_dir($directory) && is_writable($directory);
 

=== modified file 'modules/block/block.test'
--- modules/block/block.test	2009-08-28 19:44:05 +0000
+++ modules/block/block.test	2009-10-03 17:55:43 +0000
@@ -229,6 +229,7 @@ class NonDefaultBlockAdmin extends Drupa
   function testNonDefaultBlockAdmin() {
     $admin_user = $this->drupalCreateUser(array('administer blocks', 'administer site configuration'));
     $this->drupalLogin($admin_user);
+    variable_set('preprocess_css', 0);
     $this->drupalPost('admin/appearance', array('status[stark]' => 1), t('Save configuration'));
     $this->drupalGet('admin/structure/block/list/stark');
     $this->assertRaw('stark/layout.css', t('Stark CSS found'));

=== modified file 'modules/color/color.test'
--- modules/color/color.test	2009-09-01 20:40:40 +0000
+++ modules/color/color.test	2009-10-03 17:44:24 +0000
@@ -37,6 +37,7 @@ class ColorTestCase extends DrupalWebTes
     $edit['palette[link]'] = '#123456';
     $this->drupalPost('admin/appearance/settings/garland', $edit, t('Save configuration'));
 
+    variable_set('preprocess_css', 0);
     global $theme_key;
     $this->drupalGet('<front>');
     $stylesheets = variable_get('color_' . $theme_key . '_stylesheets', array());

=== modified file 'modules/simpletest/tests/common.test'
--- modules/simpletest/tests/common.test	2009-10-01 19:04:25 +0000
+++ modules/simpletest/tests/common.test	2009-10-03 17:55:43 +0000
@@ -396,6 +396,7 @@ class CascadingStylesheetsTestCase exten
     parent::setUp('php', 'locale');
     // Reset drupal_add_css() before each test.
     drupal_static_reset('drupal_add_css');
+    variable_set('preprocess_css', 0);
   }
 
   /**

=== modified file 'modules/system/system.admin.inc'
--- modules/system/system.admin.inc	2009-09-30 13:09:29 +0000
+++ modules/system/system.admin.inc	2009-10-03 17:55:43 +0000
@@ -1437,7 +1437,7 @@ function system_performance_settings() {
   $form['bandwidth_optimization']['preprocess_css'] = array(
     '#type' => 'checkbox',
     '#title' => t('Aggregate and compress CSS files into one file.'),
-    '#default_value' => intval(variable_get('preprocess_css', 0) && $is_writable),
+    '#default_value' => intval(variable_get('preprocess_css', 1) && $is_writable),
     '#disabled' => $disabled,
   );
   $form['bandwidth_optimization']['preprocess_js'] = array(