I am making a custom modpack called "A Little Mix of Everything" and ever since I removed Optifine, there have been issues with the Fancy Graphics setting. If I startup minecraft with Fancy graphics, it shows the main menu and works smoothly for a couple of seconds and the player and mob shown by the BSPKRSCore mod are moving fine. After the smooth seconds it completely freezes and the BSPKRSCore player and mob don't follow the cursor at all and then it crashes. From there, I have to go to the .minecraft folder and edit the options.txt file to set the graphics to fast. However, if I start up minecraft and change graphics to fancy, and go back to the menu, it does not crash. I then tried exiting out of minecraft thinking I fixed it, only to find out that I had to do the whole options.txt thing again. I have tried installing the latest Graphics Card drivers from NVIDIA Geforce Experience, but it says I have the most recent drivers. I know I don't need Fancy Graphics, but I would like to fix it so when I publish it, no one will have problems with it. Please help me with this perplexing issue.