1. When dragging columns, it's impossible to move a column adjacent to the blank space at the far right (i.e. to make it the rightmost column) simply by dropping it there (the green indicators don't appear and the column isn't moved). Instead, I have to drop it directly left of the rightmost column, then drag and drop that rightmost column to the left of the columned I moved next to it.

 

2. When dragging to the extreme left, the green indicators appear to suggest the column would appear to the left of the row header, but on dropping, it is moved into the second slot from the left. This makes sense as the header should be in slot one, but I guess the indicators just shouldn't appear for that spot.