Fit to time series (anomaly search) - cannot re-search after changing FF

[colettew]

Having loaded a model I pick forcing function #4 and apply it to PP
Then I go into fit to time series, click anomaly search and search
My SS goes down and all is good.
Now I decided i want to run it again just because
So I go back to forcing functions, click this time on forcing shape #6, then apply the forcing function to PP.

Going back to fit to time series, anomaly search - I then cannot search again.
The search button stays grey and does not allow me to run the search function again.