I'm having some trouble with MacHg using a lot of CPU.
I don't know exactly what is causing this, but after a while with MacHg open it begins using a lot of CPU (80% to 100%). Usually I'm not even using MacHG at the moment it begins, I have it minimized and I'm working on textwrangler with some code.
I'm on Snow Leopard 10.6.5
I hope you can take a look at this issue.