I started with pre5, but it crashed on loading my save.
So I started loading the game with the Pre1, pre2 and pre3. PRe4 and 5 simply crashes the game (after I chose my save to load, I get back to the tile screen. If i try to load the save again, crashes).
Well, I try to fix the circuits by myself with minetweaker. It was ages since I used that thought...