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When I convert a ladge array from Mathcad 15 to Prime by the converter I get at some values not correct minus - see the picture.
And second and main
Prime cannot work with this ladge converted Mathcad 15 file H2O (see the attach) - try please convert and work!
May be you get a luck! It is one WaterSteamPro file:
While your MC15 file opened fine w/o problems in MC15, opening the converted file in P3 freezed my machine and I had to kill Prime via taskmanager,
You may consider burning the problem down to a small file showing the error.
Its also noticable from your screenshot that the number in question is in italics in contrary to the others - how is it labelled?