For some reason, when the tar distiller and the road factory are next to each other, right clicking on the road factory will crash the game.

Steps to reproduce:

1. Get a tar distiller and a road factory.
2. Place the tar distiller
3. Place the road factory to the right of the tar distiller, and make sure they're linked.
4. Place coal and lava into the tar distiller
5. Right click on the road factory.

Crash Log

Since this is a server that is not mine, I do not have access to the crash log. Sorry.

So I just crashed it again, this time making roads. I waited until the tar distiller was empty, put crushed rock in the road factory, and it made 8 blocks of standard tarmac road blocks, then the red status bar kept going from empty to full, but it wasn't consuming any tar. My gut want's to tell me that it's a problem with changing the value of tar in the road factory tank. This time, it updated from 31000 to 30000, and then everything stopped, and then the server crashed.