High CPU with Solaris 5/08 Guest

[loncano6]

I have a Macbook with dual core and Leopard. Sometime back I tried the Beta Virtual Box and Solaris 8/07--I saw 100% CPU in the Mac Activity Monitor.

So I waited for the VB 1.6 GA and tried again installing Solaris 5/08. Same problem. I tried installing Guest Additions - no help. My buddy says his Macbook with VB and Solaris is working fine....

Any ideas?

Thanks,
Mark