Ahh here you go...
http://discussions.apple.com/category.jspa?categoryID=149Apple seemed to have messed up the old behaviour of holding shift down to create a new library.
It's apparently a bug with unicode keyboard codes. You can force the old behaviour by following one of two key sequences on start up to get into debug mode:
If your keyboard has an Alt Gr key, then during start up press 'up, down, left, right, alt gr + [tab]'
If your keyboard doesn not have an Alt Gr key, then during start up press 'up, down, left, right, alt + [F4]'
I don't know if that's any use?