So I updated to the latest CofH core, lib, thermal foundation and expansion and get this client crash when connecting to my server: http://pastebin.com/vhZD2Tgv

I also updated Thaumcraft to the latest version and Buildcraft to 6.4 beta.

Cheers :)

Strange. Not really sure about this one but you seem to have a straggler tile entity without a block. I know that TileEntity.shouldRefresh() may cause this, but have no clue otherwise. Though, I would imagine somehow, that other mod interactions resulted in this happening. Either way, your best bet is to locate the straggler in MCEdit and destroy it yourself. It should look like a blockless tile entity somewhere.

That's what you get when using alpha versions on a production server. My fault I guess... Right nowI'm trying to rollback and downgrade to older versions of CofH to be able to update it.

Last time I fiddled with MCEdit it screwed my map so I stay away from that for now.
Thank you for your support, closing this as it doesn't seem to be related to your mod after all.

Cheers