I have the exact same issue. I have my kiln in a house underground and i thought that maybe the dirt and stones around the pipe (leading straight up for about 30 blocks) was the problem so I removed ALL the dirt and stones ALL the way, building with bricks around the pipe. This actually worked for me until i connected a pipe from my blast furnace to the same pipe.. the "bug" reseted and now i'm back on square one and i can't figure out a way to play around the bug.
Posts made by macgoggel
RE: How am I supposed to connect iron pipes to the cement kiln?