I've attempted to try today's recommended Tekkit 1.6.4 build. The Technic Launcher asked me if I'd like to update, and I went ahead and extracted a brand new Tekkit_Server_v1.2.6.zip on my server. No existing world and a fresh, mostly unaltered server.properties. Both the client and the server are running in a Debian Linux environment with java jre1.7.0_51.
When I try to connect, I get:
Forge Mod Loader has found ID mismatches
Complete details are in the log file
ID 3400 from Mod EE3 Is missing
ID 3399 from Mod EE3 is missing
ID 2454 is mismatched between world and game
ID 2455 is mismatched between world and game
This is in ForgeModLoader-client-1.log:
2014-02-20 00:41:09 [FINE] [fml.ItemTracker] The difference set is not equal: only on left={3400=Item 3400, Type com.pahimar.ee3.block.BlockGlassBell, owned by EE3, ordinal 0, name block.glassBell, claimedModId null, 3399=Item 3399, Type com.pahimar.ee3.item.ItemBlockAlchemicalFuel, owned by EE3, ordinal 0, name block.alchemicalFuel, claimedModId null}: only on right={2452=Item 2452, Type com.pahimar.ee3.block.BlockAludelBase, owned by EE3, ordinal 0, name block.aludel, claimedModId null, 2453=Item 2453, Type com.pahimar.ee3.block.BlockGlassBell, owned by EE3, ordinal 0, name block.glassBell, claimedModId null}: value differences={2454=(Item 2454, Type com.pahimar.ee3.block.BlockAludelBase, owned by EE3, ordinal 0, name block.aludel, claimedModId null, Item 2454, Type com.pahimar.ee3.item.ItemBlockAlchemicalChest, owned by EE3, ordinal 0, name block.alchemicalChest, claimedModId null), 2455=(Item 2455, Type com.pahimar.ee3.item.ItemBlockAlchemicalChest, owned by EE3, ordinal 0, name block.alchemicalChest, claimedModId null, Item 2455, Type com.pahimar.ee3.item.ItemBlockAlchemicalFuel, owned by EE3, ordinal 0, name block.alchemicalFuel, claimedModId null)}
2014-02-20 00:41:09 [sEVERE] [fml.ItemTracker] FML has detected item discrepancies
2014-02-20 00:41:09 [sEVERE] [fml.ItemTracker] Missing items : {3400=Item 3400, Type com.pahimar.ee3.block.BlockGlassBell, owned by EE3, ordinal 0, name block.glassBell, claimedModId null, 3399=Item 3399, Type com.pahimar.ee3.item.ItemBlockAlchemicalFuel, owned by EE3, ordinal 0, name block.alchemicalFuel, claimedModId null}
2014-02-20 00:41:09 [sEVERE] [fml.ItemTracker] Mismatched items : {2454=(Item 2454, Type com.pahimar.ee3.block.BlockAludelBase, owned by EE3, ordinal 0, name block.aludel, claimedModId null, Item 2454, Type com.pahimar.ee3.item.ItemBlockAlchemicalChest, owned by EE3, ordinal 0, name block.alchemicalChest, claimedModId null), 2455=(Item 2455, Type com.pahimar.ee3.item.ItemBlockAlchemicalChest, owned by EE3, ordinal 0, name block.alchemicalChest, claimedModId null, Item 2455, Type com.pahimar.ee3.item.ItemBlockAlchemicalFuel, owned by EE3, ordinal 0, name block.alchemicalFuel, claimedModId null)}
The previous recommended version of Tekkit worked just fine, "out of the box".
I'm not very familiar with the inner workings of Minecraft, mods and item id numbers and whatnot, so what is the best course for troubleshooting/resolving this issue?