The low budget Michelle Rodriguez movie The Assignment involves a plot where a killer is punished by a mad surgeon by being given a male to female sex change.
It is not a great movie and was not well received critically (but no movie with Sigourney Weaver can be that bad, surely).
But the original title "The Assignment" gives seems bland to the point of anonymity and gives nothing away about the bizarre plot. But this was changed for some international markets (like the UK) to "Tomboy" which at least hints at the key element of the plot.
Why was such a bland title originally chosen and why was it changed for international release?