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Datapage+4.1 not calculating CP/CPK from imported data from Version 3.33

So I ASCII archived a 30pc study from datapage 3.33 & imported it in Datapage+ 4.1. The import went well & as far as I can tell all of the data is there, but when I try to calculate CP/CPK, I get either NaN or 0.000 depending on how I set the subgroup parameters. Any ideas?