Clone tool repeating over & over after the first click!

HI,

I'm on CS5 Extended, and my clone tool has stopped working properly.  It is repeating itself over & over again after the first click.  For instance, I am trying to move a family over to the left a little bit.  The clone tool works as it should for just the first click.  After I release my curser and pick-up where I left off, the clone tool jumps back and repeats the initial source - so if I stop cloning at the face and click again, it is not remembering where it left off.  I am of course under a deadline - Adobe tech support took my computer over and could not fix the issue either - we reset everything.  He is saying that my computer is too new for CS5, so I would like to avoid the unintall/reinstall process if possible.

Thanks!