Getting java.lang.ClassNotFoundException: crazypants.enderio.conduit.BlockConduitBundle,
and java.lang.NoClassDefFoundError: mods/immibis/core/api/multipart/IMultipartRenderingBlockMarker

crashlog: http://paste.atlauncher.com/view/cdd71440

(is this the same thing that was happening a few months back with cofh's outdated apis? i seem to recall something like this happening previously.

Hard to say, I need to download that log and cut it into sessions.

First guess would be load order.

Try updating immibis core