Efemeril

I'm getting issues with the particle effects of the Rockomax BACC Solid Rocket Booster. All the other engines I've tested are fine, but the particles for this solid booster seem to not be transparent - each particle texture is box-y. I've narrowed the issue to Kerbpaint, which is a shame as I really want to use this mod. Maybe check to see if the mod alters these specific particle effects? I'm not familiar enough to fix it myself.