Here we go... The trail effects, e.g. cake block candle flames, mobile generator smoke trail, bubble power on sparkly trail, don't seem to be working in the latest stable. Here is a comparison between 0.7.6 and 0.7.7 tested with the same setup (same tech in Creative mode, graphics on Fastest, 640x400 resolution, draw distance minumum, all other graphics settings ticked off except Full Screen). 0.7.6 Smoke and flame trails are clearly seen. 0.7.7 The effects are (kind of ) playing, but not making trails. Could this be related to the elusive Refinery Smoke Bug?(still can't find it, it must have heard of my quest!) Output logs for 0.7.6 and 0.7.7 clearly labelled below.