Cubase 6.5 and RME Babyface

Hi there, I have recently purchased an RME babyface and I am using it with Cubase 6.5.0. My operating system is Mac OS 10.7.5. The problem I am having is that everytime I load Cubase the volume of my babyface boots automatically giving me an unwanted blast of sound. Even if I turn the volume down to work on a project, upon quitting cubase the volume boots again. Does anybody know what would cause such a problem? I tested out my babyface on other Daw’s to see if it would do the same thing and it only seems to be Cubase that’s the problem. Any help on this would be much appreciated. Thanks!