I hope you're not on Vista. If you are, I hope you have another PC/lappy with XP. I had the same issues with Vista home premium on my new laptop, but just do all my tuning from my XP pc, because the drivers that supposedly work for vista.... don't.
Fortunately, I don't think Castle has any other choice than to start writing the software for Vista, because XP is no longer sold (although tons of people still run it).
I can't help but wonder -- do any 64-bit system users have any MM problems?