Pavoni Si - leak from above filter holder

I just got a "new" Pavoni Espresso Si machine but when I make the espresso, water leaks out from the top of the filter holder (where the filter holder attaches to the main plastic part of the machine) and also from the crack just above the Pavoni seal on the front of the main part of the machine. Any ideas?

Also - a question - how hard are you supposed to turn the porto-filter in the holder? just till it locks or further? I can push it quite far but am not sure if I need to.