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Don't quote me on this, but you might have installed a client version to the server, I THINK the server asks for clint forge hooks there... but idk. Might also be that you need to update forge. I run a server with like all the mods and forge 171 with the FMLServerHandler fix. and it does work indeed. but yeah, that client thingy can be outdated forge too 
This is awesome! it fixed it for my server and I didn't get any issues with mystcraft either.
Note that this is fixed in 1.103
Forge 171 does not have the 164 issue if you use the FMLServerHandler fix on the support section's sticky.
Also, missing isGenMineableReplaceable is a CLEAR sign of using ID Resolver, which due to its dependency on the old 4096 fix, is incompatible with Forge right now. ShaRose and Lex have worked out some details into merging it, but I don't know where did that go really.
Could you be really nice and link? I can't seem to find it.
I have the exact same error in tekkit 3.1.2, both on singleplayer and my own multiplayer server (using hamachi). The nano saber, while off, behaves exactly as expected. Once switched on, it cycles through on, off, equipping and unequipping in no apparent order. I would attach a screenshot, but it would not properly demonstrate the error. Once, I managed to get the error to not occur, but I have no idea how
EDIT: Even while appearing to be off, the sword is still actually on, and still one-hits creepers, but the graphical problem is still very annoying, and a fix would be greatly appreciated.
FIX!!!!!: Go through a nether portal with the glitching sword on, and come back immediately. Fixed.EDIT: This fix is not entirely reliable, as I was able to implement it twice before it stopped working, including the time above when I didn't realize that it was the nether portal that had fixed the sword. I believe that the sword needs to appear on at the moment the travel completes, though this is nearly impossible to practically achieve.
First of all, we won't help tekkit users here. Tekkit is very bad coded and has it's own bugs which ic2 devs can't help.
And for ShamblerDK, you don't need NEI plugins on the server, it will most likely cause some sort of bug or crash.
forge 164 makes machines upsidedown and stops the work of energyflow
forge 171 has the exact same issue as 164
forge 152 is the only version that makes machines work, though NEI server can't use it.
EDIT: These problems are only SMP
That's related to the machine rotation bug (server not sending out world ticks properly). Use 3.4.9 with the FMLServerHandler fix.
3.4.9 Didn't fix it for my server. not the machine rotation bug, not the energy flow bug, not the quantum helmet bug. forge 152 was the only solution that worked for me
And no, I don't know anyone who call the IC2 Wrench Bronze Wrench. i think you are alone with calling it that.
I noticed this as well on my private server. Backdating forge to 160- fixes it.
It doesn't for my server 
If you rightclick with a empty cell on oil, you get a watercell
