When I exclude an entire row in InStat Mac, then save and reopen the file, InStat thinks the wrong row is excluded.

There is a bug in InStat 3.0b.  if you select an entire row and exclude, Prism gets confused when it reopens the file. But if you select a range of cells, and exclude them, it works fine.

The work around, therefore, is to select a range of cells (which might be an entire row), but do so by dragging from one cell to the next, not by selecting an entire row. When cells are selected that way, excluding works fine.