I am currently trying to use R3DCraftx256. When I try to enable the resource pack and click "Done," it freezes and acts as if the resource pack is opening, but it resets and goes back to default. I tried this with another resource pack, also, but the problem continued. I had this problem persist after two restarts of my computer, several re-installs of the resource pack, and reinstall of OptiFine. I don't know if it is an OptiFine issue or a software issue. If anyone knows a solution, I would be very glad. THANKS!