Just realised that I was trying to add vectors to an SVG file, which I'm assuming I don't need to do?
Going back to the start, I have
used photoshop to alter a logo so that it can be cut without the centre falling out
then used inkscape to create an SVG file which has much smoother lines.
when I open in cut2dpro, how do I add the cutting nodes to the SVG file? to then export as a DXF file?

Please excuse my ignorance, I'm probably missing something obvious here.

Tried to carry out jazzcnc's litttle trick, but just couldn't get it to work out!