Item ID Mismatch: Tech World 2

[Nyxeria]

Problem short: Item ID mismatch when client tries to log in.
OS: Win 7 Pro x64
Server: Local designated. Specs: i7 3960x, 32Gb RAM, 2xSSD (sum. 240Gb). Other tested server: i7 2600, 16GB RAM, 2x2TB HDD

FTB version: Tech World 2 1.1.7 and 1.1.6 server and client have matching version. Straight out of the box. Java version 8.0.11

Problem long: When Client tries to log in on server, login fails because of item mismatches. Item mismatches are mostly railcraft trying to overwrite vanilla carts. I've tried to copy mods and configs back and forth, using text crawlers to find ID:s, but it appears these item overwrites are hard coded in the mod. Problem affects Tech World 2 versions 1.1.6 and 1.1.7 Here the error code:

2014-10-26 21:49:24 [SEVERE] [fml.ItemTracker] FML has detected item discrepancies
2014-10-26 21:49:24 [SEVERE] [fml.ItemTracker] Missing items : {}
2014-10-26 21:49:24 [SEVERE] [fml.ItemTracker] Mismatched items : {342=(Item 342, Type net.minecraft.item.ItemMinecart, owned by Minecraft, ordinal 1, name null, claimedModId null, Item 342, Type mods.railcraft.common.carts.ItemCartVanilla, owned by Railcraft, ordinal 1, name railcraft.cart.chest, claimedModId null), 407=(Item 407, Type net.minecraft.item.ItemMinecart, owned by Minecraft, ordinal 3, name null, claimedModId null, Item 407, Type mods.railcraft.common.carts.ItemCartVanilla, owned by Railcraft, ordinal 3, name railcraft.cart.tnt, claimedModId null), 343=(Item 343, Type net.minecraft.item.ItemMinecart, owned by Minecraft, ordinal 2, name null, claimedModId null, Item 343, Type mods.railcraft.common.carts.ItemCartVanilla, owned by Railcraft, ordinal 2, name railcraft.cart.furnace, claimedModId null), 328=(Item 328, Type net.minecraft.item.ItemMinecart, owned by Minecraft, ordinal 0, name null, claimedModId null, Item 328, Type mods.railcraft.common.carts.ItemCartVanilla, owned by Railcraft, ordinal 0, name railcraft.cart.basic, claimedModId null), 58=(Item 58, Type net.minecraft.block.BlockWorkbench, owned by Minecraft, ordinal 0, name null, claimedModId null, Item 58, Type xk.xact.core.blocks.BlockVanillaWorkbench, owned by xact, ordinal 0, name XACT Workbench, claimedModId null), 335=(Item 335, Type net.minecraft.item.ItemBucketMilk, owned by Minecraft, ordinal 0, name null, claimedModId null, Item 335, Type powercrystals.minefactoryreloaded.item.ItemFactoryBucket, owned by MineFactoryReloaded, ordinal 8, name item.mfr.bucket.milk, claimedModId null), 79=(Item 79, Type net.minecraft.block.BlockIce, owned by Minecraft, ordinal 0, name null, claimedModId null, Item 79, Type powercrystals.minefactoryreloaded.block.ItemBlockVanillaIce, owned by MineFactoryReloaded, ordinal 0, name blockVanillaIce, claimedModId null)}

Does anyone have fix to this?

E: Problem affects version 1.1.4 too.
EE: Problem affects java version 7 update 71 too.
EEE: Problem affects java version 7 update 51 too.


EEEE:

The problem fixed itself, running server in Java V8 u11 and the game in Java V7 u51. I changed the railcraft jar on server and clients to this http://minecraft.curseforge.com/mc-mods/51195-railcraft/files/775935

OH, AND DO NOT RUN SERVER AS ADMIN UNLESS NECESSARY, may be cause of all the trouble.