I've noticed that to, with sheetcam and my dxf preview image maker, sometimes splines work and sometimes not, splines are just a really strange curve form, I haven't been able to figure them out completely, and I can't find any good documentation,
I sure like the forum to, it's so easy to use, and it works good for graphics, I never expected it to turn out like it did, and it has awesome spam filtering, not one spammer has gotten past registration, I was worried about that.... and the classifieds section is really powerful, you can sell stuff, get paid, and rate sellers, and everything, once I finish 2013 series I will get back to developing the forum more