This depends on if you're lagging or if you need a patch for it. If it's lagging I recommend installing optifine to your minecraft.jar folder. If that's the case Google "Optifine download and installation tutorial" If you need a patch and it's just wierd lighting glitches or delayed block breaks, at the sign-in part of your minecraft client, click options and turn on force update. It will delete all mods but it will fix these glitches. You're welcome if this helped :) -YouTube.com/user/DjOver9000
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You need to update your texture pack to the same version as Minecraft.Every time Minecraft updates the game it will break almost every mod/texture pack so the mod writers have to update them to run right again. It can take hours or weeks depending on how large the mod or texture pack is to update them again.
Not possible (so far.)
you could use an action replay or other sort of cheating device to get an over due event pokemon. i'm sure it's safe and i don't think it is glitching.
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You can email Minecraft if you have any questions about Minecraft. That's what the Minecraft Help Email is.