FOR 1.9 VERSION: IF YOU HAVE THIS CRASH IT IS FORGE, DON'T POST:
net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/client/model/TRSRTransformation

What Version of NeoTech are you using: 2.4.4

If possible, did you break and replace the block: Yes, After initial crash. Breaking and replacing the fluid generators appears to fix whatever is wrong with the blocks that were in the world at time of mod update.

Please Pastebin.com the crash Report and put link here:
Initial Crash Report http://pastebin.com/KbZrGrh2

The setup is a Server and Client SMP. After updating the neotech mod on the server and the client, I attempted to access one of the fluid generators that was in the world prior to the update. Upon right clicking, the client crashes with the above error. Restart the client, break (with a tcon pick, not sure if the tool matters but being thorough) the fluid generator, replace it, and right click and the gui opens as expected. Tried one of the other fluid generators that did not have lava in it prior to the update, and it also crashed the client.

It would appear that for some reason, Fluid Generators placed in the world previously, must be broken and replaced before you can access the GUI when you update to 2.4.4