it looks like black smoke is an expobolts of boosters. smoke color of the second stage "volumetric transparent"When you first launch, exhaust is a orange color. Around t+1 minute, the plume expands and it turns red. At around 2 minutes (booster separation, it is a soot black color.
Before attaching anything to an MS2015 vessel, the payload on the ini file must be set to LIVE=1 or else it would sport a dummy static mesh that represents the payload itself. Also, the spacecraft that is being defined as a payload on an MS2015 ini file is the only vessel that can be attached to it directly.how it is possible to place four different ships connected by attachments and having different configs in the payload? (Multistage2015 and VesselBuilder)
AFAIK the "Tulip" arms hold the side Bloks and not the core (which sits on the side Bloks), so you have the vehicle placed 45º off from what it should be. Also, on the third image the arms moved back a bit too much.