Index: /CKEditor/trunk/_source/plugins/dialog/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 7557)
+++ /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 7558)
@@ -964,4 +964,6 @@
 			this.fire( 'hide', {} );
 			this._.editor.fire( 'dialogHide', this );
+			// Reset the tab page.
+			this.selectPage( this._.tabIdList[ 0 ] );
 			var element = this._.element;
 			element.setStyle( 'display', 'none' );