tstab method in hb with mmsim12

Hello,

In the old versions of mmsim (now I'm using the v12) it was possible to set the method used by the initial transient (tstab). How can I set it in mmsim12?

In my simulations transient gives a correct result whereas hb/tstab predicts a strange behaviour that prevents the hb simulation to converge. Which are the default methods of the 2 analysis, tran and hb/tstab? Are there other different settings?

Thank you very much

Best regards

Aldo