Found something strange…
This happens on my Mac (Snow Leopard 10.6.4). When adding a location by default it adds a single “/” on the location – but this makes it not work. Adding another slash “//” corrects it and I don’t get security errors.
This is probably the answer to my earlier Sandbox Security issue – http://kafkaris.com/blog/2010/05/12/fdt-xml-security-sandbox-violation/