Gerry as usual is spot on - CutViewer does seem to insist on Incremental arc mode and I haven't found a way to change it. I always use incremental arc centers so did not realise this myself until a few days ago.
In CamBam, click on the Machining folder in the drawing tree and you should see a property called ArcCenterMode which you can change to Incremental.
In Mach3, under general config, there is a matching option called arc centers which you can set to Inc.
I hope this helps.
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