Groove agent hangs in C6 and C5

Hey there,
I have just installed cubase 6 and have updated to the current on a new imac I5 2.7. I tried using Groove agent for the first time and got the spinning beach ball on every command afterwards, even after removing groove agent from the project. It was driving me nuts so I thought I would try a new project in C5 and had the same problem once Groove agent was launched. Has any one else experienced this and more importantly how can I fix this?