The problem with over-application of morphs if you inject (or remove and then inject) a second character to a loaded figure hasn't been fixed in 1.2.0.1, unfortunately. It sounds as if that is what you are experiencing. Your video card won't affect your 3Delight renders - it matters only for OpenGL renders and the preview. Try going to Render>Render settings>Advanced and reduce the bucket size. You can also try reducing the Max Raytrave depth setting if the ernder is choking on reflections, though if you pull it too low you may find things aren't reflecting correctly (it controls how often a line-of-sight from the camera can bounce before it's curent value is taken: set it too low and it may stop at a mirror rather than reaching the object that should be reflected).