I have noticed that if I view the "Consolidated" portfolio, I can sort by each of the columns.
But if I view a specific portfolio, and sort, say on the %Gain column, then if I select a different column heading to sort, I can't go back to the %Gain column and re-sort unless I select a column that has not been sorted on yet.
I notice that when I sort on a column within a specific portfolio, the little triangle indicating the direction of the sort doesn't go away when I select a different column. But it does in the "Consolidated" listing.
I hope I have explained this clearly.