15 October 2013: RSAT applies cut off differently in PSA and PSAP 
RSAT applies the cut off in an incorrect way. As a result, there are more cut sets in the modularized cut set list than in PSA Professional (RSAT 2.*), even though the demodularized cut set list is the same as in PSA Professional. 
This means that you probably will see a slightly higher top value (frequency or probability) using RSAT 3.* compared to using RSAT 2.*, even though the demodularized MCS list are identical. The difference will however be very small if any difference at all. 
Fixed in 3.3.0 
RiskSpectrum Analysis Tools (RSAT)