I don't know why, but sometimes the quarry stops to output items in the pipe, connected to it. I'm using a stone pipe and Thermal expansion energy conduits. Recently I updated the buildcraft mod to its latest version and then this problem occurred.

Can you replicate the issue with a BC energy pipe? Is nothing connected on the bottom?

I just tried to connect BC pipes, it still had no output.

However when I restarted the server it started to work again o_0.

might be connected to #2790 it might have been outputting but not rendering the items