A1 - Mac problem

I’m having trouble getting the A1 soft synth to open up in an instrument track. I’m using Cubase 6.0.2 on a Mac Pro OSX 10.6.3 Quad core Intel Xeon 2.93GHz. I see the A1 in the vst instrument selection when creating an instrument track and can select the A1, but when the track appears there is no gui to click on or track name to select. The A1 is listed in the Plug-In info window… Any ideas on a fix? I’ve seen the A1 work on Windows 7… hopefully it will work on a Mac.