I know that the Quran had 7 types of Qira'at and now the muslims use only one (I think Hafs?). So doesn't that change the interpretations and meanings of the Quran? Doesn't that mean it has 7 different versions?

I'm especially concerned since Arabic words meanings are very depended on "Tashkeel", so a change in pronunciation of a word would change its entire meaning.

[Qira'at - wikipedia](http://en.wikipedia.org/wiki/Qira%27at)

See especially this [Examples of Readings from Hafs and Warsh - wikipedia](http://en.wikipedia.org/wiki/Qira%27at#Examples_of_Readings_from_Hafs_and_Warsh) 

I haven't read this, but it seems to have the answer: <http://www.islamic-awareness.org/Quran/Text/Qiraat/hafs.html>