Which version of our software are you using and which product is it? Are you using 3D Invigorator PRO or ProAnimator?
One thing you can do is to check the Output panel and see what AntiAlias setting you are using. If you are not using AntiAlias, be sure to set it to 3x3 or higher. If you are using ProAnimator version 8, set the AntiAlias setting to Best and see if that helps.