Joa7000

There seems only to be a problem with SRB's that are attached directly to decouplers (both radial and stack) without having any 'other' fuel in that child-assembly. Placing fuel in the same stage as the SRB will calculate them into the TWR. It can even be done by placing a Oscar-B fuel-tank on top of the booster, as long as the child-assembly of the decoupler containing the SRB has some fuel. The boosters also get calculated when placed directly onto the root-part. Hope this helps until the code gets fixed.