GamerBah

It does go to the yes or no screen, but won't let me click anything. After 1 second, it goes to shutting down internal server. I have the log posted above in the spoiler.

But how can I play my world again?

Here's the big cheese: I created a survival world because I was sick and tired of playing on creative mode. I got some new mods, and proceeded to create my world. I was searching for a mob from the Ice Cream Creeper Mod, and yet there were still normal creepers. I exited the world, and took the mod out. After that, I tried to play on my survival again, but had a error which said, "FORGE HAS FOUND MISSING ID's" The screen then goes to the SHUTTING DOWN INTERNAL SERVER. What should I do? Is this fixable? or do I have to keep my mods on, or otherwise delete the world? Here is the crash log:

I'm not using any texture packs... I'm just using the default...

Hi! Recently I installed Minecraft Forge as it was required in some of the mods I use. But, the water and lava textures seem to be messed up, and there is no fire. I tried to switch it in the options, but that just made the water and lava completely disappear (and I happened to be standing in a cave with lava and water surrounding me)! Is there any way to fix this?