It could be any multitude of things. If you have cut other projects with the same parameters, (feedrate, stepover, etc..) and achieved good results, then that should rule out the machine. If you have a scrap of material, you could slow the machine way down and cut a few lines to see if it still digs in. It could be the way they went about making the file in solidworks. My first impression of the picture, was that something is either not set correctly in mastercam, or the surfaces are not of a high enough resolution. Have you tried different settings for the filters, gap settings, etc. in mastercam? How about additional toolpaths for cleanup such as restmill, pencil, or finish leftover? You might be able to zoom way in on the toolpath, inside mastercam while stepping through a backplot, to see if the gouges are actually in the toolpath. If I were you, I would post your problem at CNC Zone. I think Mike Mattera is one of the Mastercam fellows there that knows a thing or two. Sorry I can't be of any more help! Maybe someone else will chime in with some advise. Let us know what you find out, I'm rather curious myself. Good luck!