BuildCraft version: 7.99.15
Forge version: 14.23.2.2618
Link to crash report or log: see below
Singleplayer or multiplayer: SP
Steps to reproduce: see below
Additional information: see below

The builder (or maybe the architect table) seems not to be working correctly.
I created a distiller setup and a heat exchange setup both with some pipes, levers and redstone engines.
For the distiller I also added some gates and pipe wire.
Then I used two architect tables to create a blueprint from each setup.
When I used the blueprints in a builder I got the following issues:

1.) Heat exchange
The builder built the whole setup except heat exchange parts and redstone engines. It also did not request the heat exchange parts and redstone engines in the builder GUI.

2.) Distiller
The game crashed few seconds after the builder started to build:
CRASH_builder_crash-2018-03-13_11.24.42-server.txt
Afterwards I was not able to reload the save game. It kept loading forever and another crash report was created:
CRASH_loading_crash-2018-03-13_11.28.56-server.txt

I then did another test:
I removed all of the pipe wires from the setup and created a new blueprint. This time the builder built
the setup but the distiller parts and redstone engines were missing and the gates were placed on the wrong sides of the pipes. The builder did not request the distiller parts, redstone engines and the gates in the builder GUI.

As shown by the builders recipe being removed in 7.99.15, the builder is not ready for survival (along with a few other things). The builder currently only 'properly' supports vanilla blocks and and doesn't even support BC blocks themselves so don't expect it to work correctly.

Side note: I wouldn't recommend reporting issues with optifine as it can cause rendering issues/crashes

Okay thank you. I'll keep that in mind.

I'll keep this open as it still needs to be fixed on our end.