I'm having the same problem. From the bug I posted on github:
On chunk reload my golden conductive pipes will stop working. They visually appear as if they are connected, but I can clearly mine the block behind them in the 'gap' between them, leading me to believe the pipes are still there, just not connected at all. This has caused my engines/pipes to explode as the power has nowhere to go.
Switch pipes are also buggy. Power will flow through when I place them, and correctly stop when I press lever attached to them. However, if I press the lever again, the pipes visually reconnect, but power will not flow through them again, leading me to believe the pipes are visually connected but again not physically so.
This only began happening with the most recent update.
This means I cannot run my machines currently, for if the chunk is reloaded my combustion engines will stop supplying power to water pump and -> kaboom. Already happened, gotta rollback. Pretty major bug.