Thanks Brad, that indeed looks to be my problem. However, it looks like it leaves me with another problem. On the downloads page for the MI4 driver update it says, "This driver can only be used with Cubase SL 3 or higher in conjunction with Mac OS X Tiger (10.4.x)..." I only have OS 10.3.9. Is there another workaround for this problem, or do you suggest downloading this one anyway? (I don't have the money to upgrade my OS.)

Also, when I go to "About" my MI4 Panel, it says my MI4 software is version 1.0.0.14 and firmware version is 1.06.

Thanks for your help!
-S