The builder does not build anything. Somtinmes the little laser-thing just wobbles around and does nothing. Tried with both templates and blueprints, powered it with both thermal expasion and buildcraft power, tried giving it a redstone signal. Have tried both with and without items in each of the modes int he set {survival, creative, creative+}.

https://github.com/BuildCraft/BuildCraft/search?q=builder&ref=cmdform&type=Issues

We hope to fix the Builder and related machines for the next major release.