GreedyTacoThief

um try this too, go into options in the technic launcher and clear the cache, also make sure "always use recommended builds" is selected

Alright so to start, by NEI i mean not enough items, I'll give you instructions on what to do. Okay first, you want to go to the folder .techniclauncher located in the Roaming folder Next inside that folder go into the voltz sub-folder and locate the folder named "coremods" inside that folder will be 2 .jar files, cut the file named NotEnoughItems 1.4.4.0 and paste it to the desktop launch voltz note: it will not work when you launch it, its okay. the two windows will appear like last time, thats okay, close out of the windows and replace the NotEnoughItems file you pasted to your desktop Now you can launch voltz, the two windows will appear like always but the "Hello" window will disappear and Voltz will launch normally

I was also having this problem, i as well tried the MAC user fix to see if it would work and it does nothing. As for myself when launching, two white boxes appear, the one is the client window where the game is played, the other is the window titled "Hello". The boxes stay white for about around a minute before a dialogue box pops up and states that an error has occurred and minecraft may not launch. It is my understanding that the problem lies within NEI but i am not certain. What seemed to fix this was going into the Voltz folder located in the .technicpack folder and removing NEI, launching voltz, letting it crash and then replacing NEI. I have no idea what this did or if it did anything at all but it seemed to work