I have been trying to build a mod pack that would include some of the mods I like but I was getting constant crashes. A little research led to this:
'Just a warning the latest Gregtech includes code to crash your game if you have Tinkers Construct installed. The fight is over Greg nerfing the amount of wood planks you get from wood and Mdiyo reversing his nerf to rebalance his mod.'
According to Greg's posts he found a great way to make other mod creators leave his mod alone - if you change any of his recipes his mod will crash the game because his mod/balance is more important. He has also stated that he doesn't care if his mod is no longer distributed by FTB as the people who play FTB are not who he writes the Mod for.
All Greg Tech Discussions Go Here | Feed the Beast
I've been listening to Slowpoke, Jaded, Mdiyo, Marathi and Ward discusing it on a twitch chat. My personal feeling are he is going the same way as Flowerchild and eventually will have to be a stand alone mod.