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Fit Life by X doesn’t work all the time!!!

My problem is that I want to run Fit Life by X. Relationship: Location and scale on a Lognormal distribution using a nested design. I need to do a test for difference in location and scale.
Normally this works fine for 5 to 6 times and then JMP starts up using the Arrhenius Celsius relationship instead of Location and scale and then I don’t get the Nested models box.
When this happens JMP can not test Location and scale because even if I change over to location and scale. JMP will not change and do the calculations.
Anyone seen this?
Best regards/Lasse
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