Feeding a Buildcraft builder a blueprint with IC stuff included leads to an instant saving chunks error.
According to this thread it's supposed to be compatible, so I wonder why? Tested with GeoGen, HV cable and fibre cable.
And I'm apparently not the only person with the issue .
I'm using BC 3.1.5, IC 1.97, Forestry, and that fossils jive with the dinosaurs and shit.