okay, here is my problem:
I have installed Direwolf20's mods + More Pistons. I'm using the ForgeML #135 AND ModLoader.
When I try to open or close a portal, there is a chance that my Minecraft COMPLETELY crashes, so no ModLoader Error Screen, it just closes.
I'm using MultiMC, so I read the logs. Here is a the important part of it:
I have Java 7 Update 5 installed, the newest version of Portal Gun & Forge, my graphics card driver is up-to-date (AMD HD Radeon 6870).
I hope you have a clue because I don't and the people on the forum thread of Portal Gun don't have a clue either.