I Have IC2, Buildcraft,Optifine,and Recipe book installed and it worked fine for about a week. Then the water in my river disappeared when i put coal in my macerator. It didn't get destroyed it was just invisible. Then when i was mining i hit a small well lit cave, heard the burning sound and i died. must have been invisible lava because i saw all my stuff burn.
Invisible lava is REALLY annoying and dangerous so please help!
Weird thing is the buildcraft oil doesn't disappear.
Now everywhere i go water and lava are invisible even as an item.
Invisible liquids glich
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Try dropping optifine into the jar again.
Or if you are using a launcher type thingy, make sure optifine is loading last.
If neither of those fix it try a fresh install. It's an optifine install issue.