Sort using the Sort by Column Button not Working

[Gazzer]

I am trying to sort a simple table of data using the Sort by Column button on the Modeling ribbon (and the one on the Modeling tab). I can never get it to work. I have followed the steps from the directions on https://powerbi.microsoft.com/en-us/documentation/powerbi-desktop-sort-by-column/ but the order never changes.

The column I am trying to use is a simple numeric index column, created using the built-in function. It doesn't work on any field I have tried, whether included in the table of displayed data or not.

Any suggestions welcome.