This appears to be a new ECM (Electronic Counter Measure). Int'l channels will soon be all gone and others to follow such as PPVs and Premium Channels. All you can do is wait, keep reading the threads. If a fix is released it will be very obvious.
New revision affecting FTAs and plastic // 2006-06-21 New revision by Dishnetwork is causing black screen on international channels.... FTAs and older plastic blockers are getting hit with this and I am sure it will spread through rest of the channels in next few days.