Player

2.0.397 is the last one for 1.6, see http://jenkins.ic2.player.to/job/IC2_experimental/397/

Looks like a bug in Lambchops, check for updates and report the crash to its author if it happens with the latest version.

RemoteIO-1.7.2-1.0.1-b5-universal.jar -> You are mixing 1.6 with 1.7 mods, upgrade to 1.7.

2014-05-01 17:31:09 [sEVERE] [ForgeModLoader] The mod AS1 (Arcane Scrolls) requires mods [DC1] to be available I have no idea what DC1 stands for, but you should find more information on the home page / thread for arcane scrolls.

What's your operating system? Is the .minecraft directory in a normal directory or some file share? Which file system? Edit: Your world name probably contained special characters, which should be fixed in the next Forge version.

Search your fml-client-latest log for **************, it should indicate what's wrong unless you use reflection to access the registry.

The mod HardcoreEnderExpansion is trying to replace a block which isn't currently supported. It corrupts the registry while trying to replace one regardless, leading to the crash mentioned.

It's a known issue which is being fixed, no worries.

The IDs themselves are being synchronized as well, the client will run with the exact same IDs as the server. The IDs not just being translated at the network borders. Wait for the ID mapping fixes to be done or PM me on IRC if you want to actively help testing.

The list you are talking about only contains the very recently added TEs, all others are being retrieved through 2 HashMap lookups (one to get the Chunk, one to get the TE in there). While a HashMap is fairly quick, it'll still take a lot longer than a direct array/field access. You are supposed to use an array like TileEntity[6], one entry for each direction, to cache the neighbor TEs, not another HashMap. Be aware of annoying and random side effects due to out of date caches though.