simply movies is a video addon for XBMC and maybbe requires a proxy ip to access it ..
Navi-X is a program addon for XBMC [ big difference ]
Navi-x was down for 4 months due to server upgrades
is back now but really not much better than it was to be honest but they do say that after few more days it will improve as new links are being uploaded .
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Barney2222