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1. Kill the moviebox app by opening the multi-task tray that opens when you double click your home button.
2. Using iFile or iFunbox go to var/mobile/library/caches and delete the line that says com.moviebox.etc. or something close 
3. Again using iFile now go to var/mobile/library/preferences/ and delete the com.trendico.moviebox.plist
4. If you use the trash function in your iFile make sure you empty your trash out. 
5. Open moviebox and it should work now.