Engineering identified an issue that may cause the behavior you describe. The sample message doesn’t contain any date information for the two attachments. You can see this if you look at the properties page for the message. The applet was rejecting any attachments that did not expose date properties.
I have sent you an updated version of the applet that will accept undated attachments. We will also post an update in Cool Solutions.
(I noticed the email address you supplied bounced. I have tried re-sending the applet to you today).