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This looks like several (!) of the mod files have been corrupted somehow... Typically file corruption will only affect one file so I'm somewhat sceptical that this actually is file corruption, but in case it is try re-downloading the server.

This might be caused by a config mismatch between you and the server. Ask an admin for a copy of their config files if you can. In particular the redpower item/block IDs are crucial! If you remember exactly what you were doing with redpower it may be possible to narrow it down even further...

This sort of problem is very difficult to troubleshoot. Could you answer the following: 1. Is this problem occurring only on a specific server? Do other servers work? 2. If no server works, does singleplayer? 3. If this doesn't, does another FTB modpack work? Try a couple to be sure. 4. If none...

Try downloading the latest version of LWJGL from http://sourceforge.net/projects/java-game-lib/files/Official%20Releases/LWJGL%202.8.5/ . Replace all files in /minecraft/bin and /minecraft/bin/natives with the newer version of LWJGL (except the minecraft.jar ofc).

This is a fairly basic quite interesting memory error. This is not related to MaxPermSize! Are you by any chance using 32 bit java? If so you should definately switch to 64 bit. Alternatively (although I strongly suggest using 64 bit java), you could try lowering your memory in the settings...

Sorry, I thought you were in SP. Did a quick google and guess what I found? It's listed on the known issues thread (http://forum.feed-the-beast.com/threads/known-issues-bugs.2451/ ). I don't think you can really do much about it since you can't log in; maybe your server admin can do something?

Then try editing the options file.

While I don't know how to fix the problem as such, it seems to be caused during mob spawning, so a simple workaround would probably be to switch to peaceful - if you can pause the game fast enough to change it that is, otherwise you should edit the "difficulty" option in your...

I meant set MaxPermSize only. I don't really know how java manages memory allocation, but as far as I know the initial amount allocated to anything doesn't really matter as it will just resize when needed. So the PermSize option doesn't really matter. It could however potentially cause problems...

It isn't. 'Nuff said. Just an idea: try removing the first part, i.e. leave just "-XX:MaxPermSize=256M" or try lowering the amount from 256M to 128M or so. Also ensure you are running the latest java. You mean you don't mind - right? That is rather ambiguous :P

Alright, I've decided to look into this and reverse-engineered the relevant redpower parts (shh, don't tell Eloraam). What I think is happening is that redpower logic/wiring/whatever is loading before redpower base (not core. base. Not sure what the difference is, but hey). They then try to...

java.lang.IllegalAccessError This is java being paranoid and not letting mods interact with vanilla minecraft. First things first: update java; this is the sort of thing which easily changed with each version.

Hm... Actually it's not very likely it'll be patched as it is a vanilla bug which doesn't affect vanilla. As for what it's good for, I have a tier 5 cow spawner for food (I chose cow over pigs because of leather). Sure, there are easier (more humane) ways to get food, but I figure to heck with...

java.net.SocketTimeoutException: Read timed out It's a timeout error between you and the server. I'm going to venture a guess that as the internet works the problem will fix itself soon enough. If it doesn't though you should contact whoever is in charge of the server.

Uh... huh. Did you try my original suggestion to delete the nether (DIM-1) too?

I'm afraid it looks like your save is corrupted. java.io.EOFException is the source error, which essentially means a file is corrupted as it ended before it was supposed to. Fortunately, while I don't know which file is the corrupted one, since the error only happens after dimension -1 is...

Vaygrim's issue is fundamentally different, as it doesn't crash. Legoarf's (and Xeeno's?) issue seems to be primarily a memory issue, as evidenced by the "java.lang.OutOfMemoryError: PermGen space". The "Java Parameters" link in Booker the Geek's sig explains java perm size to some degree, try...

Well, considering I've had it running for over an hour now I don't really think anything is going to happen. At some point the memory jumped back down to 9%, and although it started going up again I'm guessing it will just jump down again later on. I tried memory sampling the game, but nothing...

Hmm... Still nothing. I'm going to afk a bit in your base and see if something happens. EDIT: The "used memory" directly after garbage collection seems to be steadily increasing though, it was at 10% at the start and has reached 15% by now... I'll see if I can't track down the cause.

Hm. I've got the world now and had a quick look around. Everything looks fine to me and I haven't noticed any lag yet.