Looks like a enderio vacuum chest and a architecture block interacting in a bad way. Were you using any of these items?
nope vacuum chest (painted with polished andesite) filter to suck up empty bucket -> output into a ender io tank to fill bucket. with the intention of attaching conduits to open crate to fill a petal apothecary . and architecture stairs surrounding the petal apothecary . so no not doing anything untoward . Is it safe for me to rejoin? thanks[DOUBLEPOST=1489322393,1489299350][/DOUBLEPOST]So i got online without crashing and used tnt to blow up the vacuum hopper and architecture blocks, so now im okay