Client Crash in certain areas

[Hewlitt]

Launcher/pack Version: Technic Launcher 2.1.1

Operating System: Windows 7 64bit

Version of Java: Version 7 Update 2 (build 1.7.0_02-b13)

Description of Problem: When users log into the server and enter the spawn area they're fine, but when they take a few steps forward they get kicked to a dirt screen. The IP is b.arcscraft.com:25595 if you'd like to test

Error Messages: Console: java.util.ConcurrentModificationException Client: Nothing, just a dirt screen or WSoD

Link to pastebin of log: http://pastebin.com/jhJ5D8Y4

[freakachu]

are you running two servers from the same directory?

[Hewlitt]

No sir, don't believe I am (It's hosted by Beastnode, so unless they've done something)

[freakachu]

try reinstalling tekkit on the server if that's possible. if it's not, contact their support with that error. I've honestly never seen an error log with that particular error before. it's very peculiar and chances are it will have to do with how beastnode is hosting their servers.

[johnlukey]

I am getting this exact same error to the letter, and it started today as well.

Could it have anything to do with this update posslby? it fits the timeframe

http://www.technicpack.net/1-2-5-has-dropped/

a few notes with the problem i am having

-I removed all plugins, still grass screens

-there is not an error, when loading up or when the player crashes

- on the console, the user does not disconnect when they grass screen, then whitescreen. Rather they 'endofstream' the moment they 'x' out of their client

-One time (but not usually every time) i crashed JavaSE crashed too

-I installed every service pack upgrade, and java upgrade n stoof

Anyone have ideas :S

Update---

I downloaded a fresh 2.1.1 Server, i was able to log in without a crash.

When i copied all the world and plugin files over to the fresh 2.1.1 I got the crash again.

But when i deleted my default world, i am able to login without crashing with the old plugins and settings

But when i go really far away from spawn, i dont crash at all. dont think it was the plugins, as i still crash without them

-----

It seems like a client error reacting to a mod item at spawn, but i crash so quickly its impossible to find anything

My server was running last night, and i guess somewhere around 3AM it got restarted??

after that dc problems rampant

Anyone have any ideas?