Question about VM 4 and Mach2

I just purchased Visual Mill and I have a minimill that I converted and am
using Mach2. I would like to post from Visual Mill with arcs, but Mach2
hangs when it gets to the arcs. I have tried several post processors and I
haven't had any success. If I output the arcs as line segments, then things
work, but the program is so much larger and takes longer to run. I thought
maybe it had something to do with tool compensation. I have tried posts
that use R and IJK. Does anyone know what post processor will work best or
what my problem might be?

Thanks,
Jeff