A few days Apple releasesed an update for iTunes, whilst this update is an improvement it actually breaks iFunbox. the update causes iFunbox to force close eveytime you plug an Apple device in. Thankfully you can downgrade iTunes using the file here.

itunes

iFunbox is used not only on jailbroken devices but also side loading apps, we are looking for options to overcome this issue so users can have the best of both worlds but for now this is the best solution.