I got this bug. Sometimes when I click on thing I get the crash report on the forum link below. I've posted it on the MC forums, Talked to the three minecraft IRC chats, I've been to the EE IRC, everywhere I can think and nobody knows what the bug is or what is causing it. Maybe someone here knows.
[IC2 v1.70 Bug] Click Error
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Forge may have been incorrectly installed, you have to put it in the jar, not the mods folder. If you are doing so, try starting a new jar from scratch.