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I wrote unusable because the entry of the OAT is quite vital for the calculation of the correct EPR setting.

In that case, you are right of course. However, the OAT fields don't cause a crash here, so that's my point on the unclear nature of the beast.  :-/ I've used them in the small tutorial and 'my' CTDs and that BSOD happened in other modes. http://www.captainsim.org/yabb2/YaBB.pl?num=1335209812

I guess we both agree on not trusting the PDCS in it's current state.  :-? I think that the data of others would be helpful too, so perhaps they join in on this thread.