Fit advisor works fine for me.
And I also think the calculation of B, C etc and A1,A2,L1, etc by the fit advisor formulas, works fine.
BUT when I change A, and hit "Calculate", none of these values will change.
The only way to get new values for B,C, etc and A1,A2, L1, etc , is to uncheck B,C,D,E,F and then hit the "Calculate" button.
This is not a huge problem.
But it took me quite some time before I noticed.
I think the manual should have warned me for this snag.
A warning in the dialogue box would be better: "Calculate" only works for unchecked boxes