Index: UI/Scheduler/UIxComponentEditor.m
--- UI/Scheduler/UIxComponentEditor.m.orig
+++ UI/Scheduler/UIxComponentEditor.m
@@ -619,7 +619,7 @@ static NSArray *reminderValues = nil;
   if(url && attachUrls)
     [attachUrls addObject: [NSDictionary dictionaryWithObject: [url absoluteString] forKey: @"value"]];
   else
-    attachUrls = [NSArray arrayWithObjects: [NSDictionary dictionaryWithObject: [url absoluteString] forKey: @"value"], nil];
+    attachUrls = [NSMutableArray arrayWithObjects: [NSDictionary dictionaryWithObject: [url absoluteString] forKey: @"value"], nil];
 
   return attachUrls;
 }
