(Move to How to if not appropriate, just want to link people this since no one ever gives real info.)
1. Describe your problem (what is happening).
2. Describe how to cause the problem (if you know how to replicate).
3. Post any error logs you have.
4. If there was no error and haven just stopped abrupty, try to find a hs_err_pid_*.log (in haven's folder iirc).
5. Tell us the following:
- What Java are you running? (Run java --version in cmd if unsure.)
- What graphics card do you have? (Especially if on laptop.)
- Have you updated your graphics card?
- What OS do you have
- What client are you running (default, ender, etc.)