I try to do that and happend the same...Did you solve it?.
Also I detectes a bug into program...when you try to rotate 45º, 135º, etc round pads... the file output of gerber2graphtec is wrong. If you set rectangular or octogonal pads is ok.
As our friend jesuscf told us, a new Silohuette Cameo has been available, somebody do some test with all scripts and gerber2graphtec and validate the same resolution as the old version?.
On the other hand, what is the best mylar product in order to manufacturing smt stencils.