Thank you guys, so far! This is really a big help! I will try and rebuild it. And maybe cut out the on off in the left hand, if it is even necessary... I did try to take the on/off out at one point - but I will start trying to rebuild and see if I can get it to work again! Thanks for the support!!!
@Mark - what I can say right now is, that if the leap motion freezes - usually it happens for all the scenes and I have to restart my computer... but this time it was only this one - so I think it is another problem. but I will go through the comments so far and see if I can work it out:)