I've just purchased DMC3 Special addition and really loving it but I've got a probably equiping new weapons.

 At the moment I'm playing on the east mode automatic on but I can only use the Rebellion and Cerberus......tried everything and I just can't seem to use any of the new weapons. I'm now stuck on mission 14 because I can't equip the beowulf to get to the door.

 Any suggestions?

 Thanks