I have slingbox 500 and comcast hd box. In the usa, my comcast box and slingplayer will work. In jan 17 slingplayer worked outside the usa, on an international wifi isp. In mar 2017 slingplayer now gives a blue comcast screen stating not cable not activated. When i returned to the usa i checked the box and slingplayer and all is fine. Has there been some change from comcast that is now detecting a foreign isp and thus blocking its signals?