From multiple instances, I have found that dynamic lights (lights created from SED) are the main reason for Acknex.exe having errors on low-end graphic cards. Just taking out the dynamic lights caused the whole program to work in a few cases where the graphics card was barely good enough to run 3DGS made games. Just some info if it might help, I definitely don't think 3DGS is a bad program in any way though. Thanks and great job on everything else!