I'm making a very nice mod, so far it's running perfectly, i only have about 2 levels, but it's still good, anyway...
when i made this cavern and put in torches in all, it seemed fine at first, no problem at all, but now every time i load it up there's some new peice of the cavern that disappears or becomes an invalid solid.
what i did to make the cavern was make a block, cut it a few times to make it an odd block, then hollow it. like i said, when i did it, there was no errors, now it's a new peice missing every time i load it, i fixed it up now, but for future reference, why is this happening?