After talking with Mark Fitzy on twitter he has found a great fix for some problems a lot of people have been having with MovieBox. People have been having problems downloading, app crashing, and streaming problems. The process he has found is very simple to do.
1.Uninstall MovieBox from Cydia
2. Install Ifile if you don't have it installed already.
3.Delete everything to do with moviebox from your file system. Caches, artwork folder and plist and then reboot and then reinstall via our repo.. lol or whatever repo you want.
Now remember this is not a guaranteed to work for all problems you have with MovieBox. but it is a good place to start.