Index: branches/5.2.x/core/admin_templates/js/uploader/uploader.js
===================================================================
diff -u -N -r15754 -r15858
--- branches/5.2.x/core/admin_templates/js/uploader/uploader.js	(.../uploader.js)	(revision 15754)
+++ branches/5.2.x/core/admin_templates/js/uploader/uploader.js	(.../uploader.js)	(revision 15858)
@@ -426,7 +426,7 @@
 
 	$('.delete-file-btn', $ret).click(
 		function ($e) {
-			$(this).attr('checked', UploadsManager.DeleteFile($me.id, $file.name) ? '' : 'checked');
+			$(this).prop('checked', !UploadsManager.DeleteFile($me.id, $file.name));
 		}
 	);