I didn't have this problem until I updated to the latest forge. Most of my mods are outdated by around 2 months, but I didn't have this problem until after updating Forge. The lava and water textures are now just solid colors on my game. Is there any way to disable mods through forge so I can test all of them one by one and see which is causing the problem just in case it isn't forge?
Edit: It was just a matter of reinstalling optifine. Sorry