  The publicly available spectrum generators for the NMSSM often lead to
different predictions for the mass of the standard model-like Higgs boson even
if using the same renormalization scheme and two-loop accuracy. Depending on
the parameter point, the differences can exceed 5 GeV, and even reach 8 GeV for
moderate superparticle masses of up to 2 TeV. It is shown here that these
differences can be traced back to the calculation of the running standard model
parameters entering all calculations, to the approximations used in the
two-loop corrections included in the different codes, and to different choices
for the renormalization conditions and scales. In particular, the importance of
the calculation of the top Yukawa coupling is pointed out.
