Using the Mac version of the Resolume 6.0 final release (tested in Arena and Avenue). Have had no luck in dragging a clip directly onto a layer slot and triggering that way. Worked on some of the older betas, but does not function properly since release. Also notice that the custom interface highlights are showing up in those empty layer slots when attempting to move the clip onto the slot (it's acting like a normal clip slot - see attached image).