Index: skinr.module
=========================================================
--- skinr.module	(revision 1.13.2.6.2.37)
+++ skinr.module	Working Copy
@@ -862,7 +862,7 @@
         $skinset = new StdClass();
         $skinset->filename = $theme->filename;
         $skinset->name = $theme->name;
-        $skinset->status = $theme->status ? 1 : 0;
+        $skinset->status = isset($theme->status) ? 1 : 0;
         $skinset->info = $theme->info;
 
         $skinsets[$type][$skinset->name] = $skinset;
@@ -915,7 +915,7 @@
 function skinr_skinset_statuses($skinset_name, $refresh = FALSE) {
   static $statuses = array();
 
-  if ($refresh) {
+  if (isset($refresh)) {
     $statuses[$skinset_name] = array();
   }
 
Index: skinr_ui.admin.inc
=========================================================
--- skinr_ui.admin.inc	(revision 1.1.2.17)
+++ skinr_ui.admin.inc	Working Copy
@@ -837,6 +837,7 @@
  * @ingroup themeable
  */
 function theme_skinr_ui_admin_skins($form) {
+  $output = '';
   $has_skins = isset($form['rows']['#value']) && is_array($form['rows']['#value']);
   $select_header = $has_skins ? theme('table_select_header_cell') : '';
   $headers = array(
Index: skinr_ui.module
=========================================================
--- skinr_ui.module	(revision 1.1.2.45)
+++ skinr_ui.module	Working Copy
@@ -370,7 +370,7 @@
           );
         }
 
-        $preprocess_hooks = $form_settings['preprocess_hook'] ? $form_settings['preprocess_hook'] : skinr_handler('preprocess_hook_callback', '', $form_settings['preprocess_hook_callback'], $form, $form_state);
+        $preprocess_hooks = isset($form_settings['preprocess_hook']) ? $form_settings['preprocess_hook'] : skinr_handler('preprocess_hook_callback', '', $form_settings['preprocess_hook_callback'], $form, $form_state);
         if (!is_array($preprocess_hooks)) {
           $preprocess_hooks = array($preprocess_hooks);
         }