This post is for my friend who doesn't have an account yet, and is only getting into FTB today. She's on a macbook pro with OS X, 4gb of RAM, duo-core 2.4ghz processor. She's got optifine installed, and told me she just downloaded the newest java update (7u10) at my prompting. Whenever she logs into my server, she keeps crashing (Server says genericReason for disconnect). I'll be the first to admit I haven't used a mac since I was in gradeschool, so I'm fairly stupid about them. Most I could do was tell her to update java (Which she did) and to get optifine. So far, no go. Here's the pastebin she gave me when she last crashed:
http://pastebin.com/zYkgVLnX
http://pastebin.com/zYkgVLnX