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best fit woes

I'm running dmis 4.2 with a Romer arm. We are having troubles with best fits.
After the program has been run a few times, the dimensioning goes hay-wire, giving us results that are unbelievable. Or some times results that exactly match the dimensioning done in the regular "ABC" alignment. If I erase the dimensioning and dimension it again the best fit results are correct.

Has anyone else run in to this problem? Any suggestions

Thanks,