Can't open new project in Logic after updating to Snow Leopard

I've been having a few problems with Logic 9 since updating to Snow Leopard (10.6.8 ) a couple of days ago.

Every time i click on "new" and try and start a new project - logic freezes and i get the rotating circle sign and Logic stops responding - eventually i need to force quit and start again.

Existing projects seem to be functioning fine, although slightly slower than before.

Does anyone have any fixes for this?! Not being able to start a new project is quite a big problem!

Thanks