I'm trying to model a six-winding transformer - three sets of centre-tapped coils, one pair with 0.25mH of inductance in each col, the next with 22.5uH and the last with 2.5uH. Coil coupling is set by
K1 L1 L2 L3 L4 L5 L6 0.99
With four winding everything seems to work, but with six, neither pair of secondaries shows any induced voltage.
Is this a known bug?